CVE-2026-21905

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-21905", "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "state": "PUBLISHED", "assignerShortName": "juniper", "dateReserved": "2026-01-05T17:32:48.710Z", "datePublished": "2026-01-15T20:19:22.158Z", "dateUpdated": "2026-01-16T16:26:02.071Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "platforms": ["SRX Series", "MX Series with MX-SPC3", "MX Series with MS-MPC"], "product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "21.2R3-S10", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "21.4R3-S12", "status": "affected", "version": "21.4", "versionType": "semver"}, {"lessThan": "22.4R3-S8", "status": "affected", "version": "22.4", "versionType": "semver"}, {"lessThan": "23.2R2-S5", "status": "affected", "version": "23.2", "versionType": "semver"}, {"lessThan": "23.4R2-S6", "status": "affected", "version": "23.4", "versionType": "semver"}, {"lessThan": "24.2R2-S3", "status": "affected", "version": "24.2", "versionType": "semver"}, {"lessThan": "24.4R2-S1", "status": "affected", "version": "24.4", "versionType": "semver"}, {"lessThan": "25.2R1-S1, 25.2R2", "status": "affected", "version": "25.2", "versionType": "semver"}]}], "configurations": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "The SIP ALG must be enabled to be vulnerable to this issue. The SIP ALG is enabled by default on MX-SPC3 and some SRX Series platforms. For other platforms, the following configuration is required:<br><br>\n\n<tt><span style=\"background-color: rgb(255, 255, 255);\">[security alg sip enable]</span></tt><br>\n<br>On SRX Series and MX Series with MX-SPC3, the SIP ALG status can be confirmed via the 'show security alg status' command:<br>\n<br>\n<tt>user@junos&gt; show security alg status</tt><br>\n<tt>ALG Status:</tt><br>\n...<br>\n<tt>&nbsp; SIP &nbsp; &nbsp; : Enabled</tt><br>"}], "value": "The SIP ALG must be enabled to be vulnerable to this issue. The SIP ALG is enabled by default on MX-SPC3 and some SRX Series platforms. For other platforms, the following configuration is required:\n\n\n\n[security alg sip enable]\n\n\nOn SRX Series and MX Series with MX-SPC3, the SIP ALG status can be confirmed via the 'show security alg status' command:\n\n\n\nuser@junos> show security alg status\n\nALG Status:\n\n...\n\n\u00a0 SIP \u00a0 \u00a0 : Enabled"}], "datePublic": "2026-01-14T17:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "A Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the SIP application layer gateway (ALG) of Juniper Networks Junos OS on SRX Series and MX Series with MX-SPC3 or MS-MPC allows an unauthenticated network-based attacker sending specific SIP messages over TCP to crash the flow management process, leading to a Denial of Service (DoS).<br><br>On SRX Series, and MX Series with MX-SPC3 or MS-MPC service cards, receipt of multiple SIP messages causes the SIP headers to be parsed incorrectly, eventually causing a continuous loop and leading to a watchdog timer expiration, crashing the flowd process on SRX Series and MX Series with MX-SPC3, or mspmand process on MX Series with MS-MPC.<br><br>This issue only occurs over TCP. SIP messages sent over UDP cannot trigger this issue.<br><br><p>This issue affects Junos OS on SRX Series and MX Series with MX-SPC3 and MS-MPC:</p><p></p><ul><li>all versions before 21.2R3-S10,&nbsp;</li><li>from 21.4 before 21.4R3-S12,&nbsp;</li><li>from 22.4 before 22.4R3-S8,&nbsp;</li><li>from 23.2 before 23.2R2-S5,&nbsp;</li><li>from 23.4 before 23.4R2-S6,&nbsp;</li><li>from 24.2 before 24.2R2-S3,&nbsp;</li><li>from 24.4 before 24.4R2-S1,&nbsp;</li><li>from 25.2 before 25.2R1-S1, 25.2R2.</li></ul><p></p>"}], "value": "A Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the SIP application layer gateway (ALG) of Juniper Networks Junos OS on SRX Series and MX Series with MX-SPC3 or MS-MPC allows an unauthenticated network-based attacker sending specific SIP messages over TCP to crash the flow management process, leading to a Denial of Service (DoS).\n\nOn SRX Series, and MX Series with MX-SPC3 or MS-MPC service cards, receipt of multiple SIP messages causes the SIP headers to be parsed incorrectly, eventually causing a continuous loop and leading to a watchdog timer expiration, crashing the flowd process on SRX Series and MX Series with MX-SPC3, or mspmand process on MX Series with MS-MPC.\n\nThis issue only occurs over TCP. SIP messages sent over UDP cannot trigger this issue.\n\nThis issue affects Junos OS on SRX Series and MX Series with MX-SPC3 and MS-MPC:\n\n\n\n * all versions before 21.2R3-S10,\u00a0\n * from 21.4 before 21.4R3-S12,\u00a0\n * from 22.4 before 22.4R3-S8,\u00a0\n * from 23.2 before 23.2R2-S5,\u00a0\n * from 23.4 before 23.4R2-S6,\u00a0\n * from 24.2 before 24.2R2-S3,\u00a0\n * from 24.4 before 24.4R2-S1,\u00a0\n * from 25.2 before 25.2R1-S1, 25.2R2."}], "exploits": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"cvssV4_0": {"Automatable": "YES", "Recovery": "AUTOMATIC", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 8.7, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "providerUrgency": "AMBER", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "CONCENTRATED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "MODERATE"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-835", "description": "CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper", "dateUpdated": "2026-01-15T20:19:22.158Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://supportportal.juniper.net/JSA106004"}, {"tags": ["vendor-advisory"], "url": "https://kb.juniper.net/JSA106004"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "The following software releases have been updated to resolve this specific issue: 21.2R3-S10, 21.4R3-S12, 22.4R3-S8, 23.2R2-S5, 23.4R2-S6, 24.2R2-S3, 24.4R2-S1, 25.2R1-S1, 25.2R2, 25.4R1, and all subsequent releases."}], "value": "The following software releases have been updated to resolve this specific issue: 21.2R3-S10, 21.4R3-S12, 22.4R3-S8, 23.2R2-S5, 23.4R2-S6, 24.2R2-S3, 24.4R2-S1, 25.2R1-S1, 25.2R2, 25.4R1, and all subsequent releases."}], "source": {"advisory": "JSA106004", "defect": ["1876029"], "discovery": "USER"}, "title": "Junos OS: SRX Series, MX Series with MX-SPC3 or MS-MPC: Receipt of multiple specific SIP messages results in flow management process crash", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Where practical, use a firewall filter to limit SIP traffic over TCP.<br><br>Alternately, if the SIP ALG is not required, it can be explicitly disabled on SRX Series and MX Series with MX-SPC3 via:<br><br><tt># set security alg sip disable</tt><br><br>"}], "value": "Where practical, use a firewall filter to limit SIP traffic over TCP.\n\nAlternately, if the SIP ALG is not required, it can be explicitly disabled on SRX Series and MX Series with MX-SPC3 via:\n\n# set security alg sip disable"}], "x_generator": {"engine": "Vulnogram 0.1.0-dev"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-01-16T16:25:54.871316Z", "id": "CVE-2026-21905", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-16T16:26:02.071Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-21905", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-16T16:25:54.871316Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-16T16:25:58.792Z"}}], "cna": {"title": "Junos OS: SRX Series, MX Series with MX-SPC3 or MS-MPC: Receipt of multiple specific SIP messages results in flow management process crash", "source": {"defect": ["1876029"], "advisory": "JSA106004", "discovery": "USER"}, "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": 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"product": "Junos OS", "versions": [{"status": "affected", "version": "0", "lessThan": "21.2R3-S10", "versionType": "semver"}, {"status": "affected", "version": "21.4", "lessThan": "21.4R3-S12", "versionType": "semver"}, {"status": "affected", "version": "22.4", "lessThan": "22.4R3-S8", "versionType": "semver"}, {"status": "affected", "version": "23.2", "lessThan": "23.2R2-S5", "versionType": "semver"}, {"status": "affected", "version": "23.4", "lessThan": "23.4R2-S6", "versionType": "semver"}, {"status": "affected", "version": "24.2", "lessThan": "24.2R2-S3", "versionType": "semver"}, {"status": "affected", "version": "24.4", "lessThan": "24.4R2-S1", "versionType": "semver"}, {"status": "affected", "version": "25.2", "lessThan": "25.2R1-S1, 25.2R2", "versionType": "semver"}], "platforms": ["SRX Series", "MX Series with MX-SPC3", "MX Series with MS-MPC"], "defaultStatus": "unaffected"}], "exploits": [{"lang": "en", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability.", "supportingMedia": [{"type": "text/html", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability.", "base64": false}]}], "solutions": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: 21.2R3-S10, 21.4R3-S12, 22.4R3-S8, 23.2R2-S5, 23.4R2-S6, 24.2R2-S3, 24.4R2-S1, 25.2R1-S1, 25.2R2, 25.4R1, and all subsequent releases.", "supportingMedia": [{"type": "text/html", "value": "The following software releases have been updated to resolve this specific issue: 21.2R3-S10, 21.4R3-S12, 22.4R3-S8, 23.2R2-S5, 23.4R2-S6, 24.2R2-S3, 24.4R2-S1, 25.2R1-S1, 25.2R2, 25.4R1, and all subsequent releases.", "base64": false}]}], "datePublic": "2026-01-14T17:00:00.000Z", "references": [{"url": "https://supportportal.juniper.net/JSA106004", "tags": ["vendor-advisory"]}, {"url": "https://kb.juniper.net/JSA106004", "tags": ["vendor-advisory"]}], "workarounds": [{"lang": "en", "value": "Where practical, use a firewall filter to limit SIP traffic over TCP.\n\nAlternately, if the SIP ALG is not required, it can be explicitly disabled on SRX Series and MX Series with MX-SPC3 via:\n\n# set security alg sip disable", "supportingMedia": [{"type": "text/html", "value": "Where practical, use a firewall filter to limit SIP traffic over TCP.<br><br>Alternately, if the SIP ALG is not required, it can be explicitly disabled on SRX Series and MX Series with MX-SPC3 via:<br><br><tt># set security alg sip disable</tt><br><br>", "base64": false}]}], "x_generator": {"engine": "Vulnogram 0.1.0-dev"}, "descriptions": [{"lang": "en", "value": "A Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the SIP application layer gateway (ALG) of Juniper Networks Junos OS on SRX Series and MX Series with MX-SPC3 or MS-MPC allows an unauthenticated network-based attacker sending specific SIP messages over TCP to crash the flow management process, leading to a Denial of Service (DoS).\n\nOn SRX Series, and MX Series with MX-SPC3 or MS-MPC service cards, receipt of multiple SIP messages causes the SIP headers to be parsed incorrectly, eventually causing a continuous loop and leading to a watchdog timer expiration, crashing the flowd process on SRX Series and MX Series with MX-SPC3, or mspmand process on MX Series with MS-MPC.\n\nThis issue only occurs over TCP. SIP messages sent over UDP cannot trigger this issue.\n\nThis issue affects Junos OS on SRX Series and MX Series with MX-SPC3 and MS-MPC:\n\n\n\n * all versions before 21.2R3-S10,\u00a0\n * from 21.4 before 21.4R3-S12,\u00a0\n * from 22.4 before 22.4R3-S8,\u00a0\n * from 23.2 before 23.2R2-S5,\u00a0\n * from 23.4 before 23.4R2-S6,\u00a0\n * from 24.2 before 24.2R2-S3,\u00a0\n * from 24.4 before 24.4R2-S1,\u00a0\n * from 25.2 before 25.2R1-S1, 25.2R2.", "supportingMedia": [{"type": "text/html", "value": "A Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the SIP application layer gateway (ALG) of Juniper Networks Junos OS on SRX Series and MX Series with MX-SPC3 or MS-MPC allows an unauthenticated network-based attacker sending specific SIP messages over TCP to crash the flow management process, leading to a Denial of Service (DoS).<br><br>On SRX Series, and MX Series with MX-SPC3 or MS-MPC service cards, receipt of multiple SIP messages causes the SIP headers to be parsed incorrectly, eventually causing a continuous loop and leading to a watchdog timer expiration, crashing the flowd process on SRX Series and MX Series with MX-SPC3, or mspmand process on MX Series with MS-MPC.<br><br>This issue only occurs over TCP. SIP messages sent over UDP cannot trigger this issue.<br><br><p>This issue affects Junos OS on SRX Series and MX Series with MX-SPC3 and MS-MPC:</p><p></p><ul><li>all versions before 21.2R3-S10,&nbsp;</li><li>from 21.4 before 21.4R3-S12,&nbsp;</li><li>from 22.4 before 22.4R3-S8,&nbsp;</li><li>from 23.2 before 23.2R2-S5,&nbsp;</li><li>from 23.4 before 23.4R2-S6,&nbsp;</li><li>from 24.2 before 24.2R2-S3,&nbsp;</li><li>from 24.4 before 24.4R2-S1,&nbsp;</li><li>from 25.2 before 25.2R1-S1, 25.2R2.</li></ul><p></p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-835", "description": "CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')"}]}], "configurations": [{"lang": "en", "value": "The SIP ALG must be enabled to be vulnerable to this issue. The SIP ALG is enabled by default on MX-SPC3 and some SRX Series platforms. For other platforms, the following configuration is required:\n\n\n\n[security alg sip enable]\n\n\nOn SRX Series and MX Series with MX-SPC3, the SIP ALG status can be confirmed via the 'show security alg status' command:\n\n\n\nuser@junos> show security alg status\n\nALG Status:\n\n...\n\n\u00a0 SIP \u00a0 \u00a0 : Enabled", "supportingMedia": [{"type": "text/html", "value": "The SIP ALG must be enabled to be vulnerable to this issue. The SIP ALG is enabled by default on MX-SPC3 and some SRX Series platforms. For other platforms, the following configuration is required:<br><br>\n\n<tt><span style=\"background-color: rgb(255, 255, 255);\">[security alg sip enable]</span></tt><br>\n<br>On SRX Series and MX Series with MX-SPC3, the SIP ALG status can be confirmed via the 'show security alg status' command:<br>\n<br>\n<tt>user@junos&gt; show security alg status</tt><br>\n<tt>ALG Status:</tt><br>\n...<br>\n<tt>&nbsp; SIP &nbsp; &nbsp; : Enabled</tt><br>", "base64": false}]}], "providerMetadata": {"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper", "dateUpdated": "2026-01-15T20:19:22.158Z"}}}, "cveMetadata": {"cveId": "CVE-2026-21905", "state": "PUBLISHED", "dateUpdated": "2026-01-16T16:26:02.071Z", "dateReserved": "2026-01-05T17:32:48.710Z", "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "datePublished": "2026-01-15T20:19:22.158Z", "assignerShortName": "juniper"}, "dataVersion": "5.2"}

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"cpe:2.3:h:juniper:srx5600:-:*:*:*:*:*:*:*", "matchCriteriaId": "68CA098D-CBE4-4E62-9EC0-43E1B6098710", "vulnerable": false}, {"criteria": "cpe:2.3:h:juniper:srx5800:-:*:*:*:*:*:*:*", "matchCriteriaId": "66F474D4-79B6-4525-983C-9A9011BD958B", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the SIP application layer gateway (ALG) of Juniper Networks Junos OS on SRX Series and MX Series with MX-SPC3 or MS-MPC allows an unauthenticated network-based attacker sending specific SIP messages over TCP to crash the flow management process, leading to a Denial of Service (DoS).\n\nOn SRX Series, and MX Series with MX-SPC3 or MS-MPC service cards, receipt of multiple SIP messages causes the SIP headers to be parsed incorrectly, eventually causing a continuous loop and leading to a watchdog timer expiration, crashing the flowd process on SRX Series and MX Series with MX-SPC3, or mspmand process on MX Series with MS-MPC.\n\nThis issue only occurs over TCP. SIP messages sent over UDP cannot trigger this issue.\n\nThis issue affects Junos OS on SRX Series and MX Series with MX-SPC3 and MS-MPC:\n\n\n\n * all versions before 21.2R3-S10,\u00a0\n * from 21.4 before 21.4R3-S12,\u00a0\n * from 22.4 before 22.4R3-S8,\u00a0\n * from 23.2 before 23.2R2-S5,\u00a0\n * from 23.4 before 23.4R2-S6,\u00a0\n * from 24.2 before 24.2R2-S3,\u00a0\n * from 24.4 before 24.4R2-S1,\u00a0\n * from 25.2 before 25.2R1-S1, 25.2R2."}, {"lang": "es", "value": "Una vulnerabilidad de Bucle con Condici\u00f3n de Salida Inalcanzable ('Bucle Infinito') en el gateway de capa de aplicaci\u00f3n SIP (ALG) de Juniper Networks Junos OS en las series SRX y MX con MX-SPC3 o MS-MPC permite a un atacante no autenticado basado en red que env\u00eda mensajes SIP espec\u00edficos a trav\u00e9s de TCP bloquear el proceso de gesti\u00f3n de flujo, lo que lleva a una Denegaci\u00f3n de Servicio (DoS).\n\nEn las series SRX y MX con tarjetas de servicio MX-SPC3 o MS-MPC, la recepci\u00f3n de m\u00faltiples mensajes SIP provoca que los encabezados SIP se analicen incorrectamente, lo que finalmente causa un bucle continuo y lleva a la expiraci\u00f3n de un temporizador watchdog, bloqueando el proceso flowd en las series SRX y MX con MX-SPC3, o el proceso mspmand en las series MX con MS-MPC.\n\nEste problema solo ocurre a trav\u00e9s de TCP. Los mensajes SIP enviados a trav\u00e9s de UDP no pueden desencadenar este problema.\n\nEste problema afecta a Junos OS en las series SRX y MX con MX-SPC3 y MS-MPC:\n\n * todas las versiones anteriores a 21.2R3-S10,\n * desde 21.4 anteriores a 21.4R3-S12,\n * desde 22.4 anteriores a 22.4R3-S8,\n * desde 23.2 anteriores a 23.2R2-S5,\n * desde 23.4 anteriores a 23.4R2-S6,\n * desde 24.2 anteriores a 24.2R2-S3,\n * desde 24.4 anteriores a 24.4R2-S1,\n * desde 25.2 anteriores a 25.2R1-S1, 25.2R2."}], "id": "CVE-2026-21905", "lastModified": "2026-06-17T10:19:07.573", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "sirt@juniper.net", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "AUTOMATIC", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "AMBER", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "CONCENTRATED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:Amber", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "MODERATE"}, "source": "sirt@juniper.net", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21905", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-16T16:25:54.871316Z", "version": "2.0.3"}}]}, "published": "2026-01-15T21:16:05.990", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA106004"}, {"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA106004"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-835"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T05:59:55.168362+00:00", "value": {"mitigation_remediation": ["Upgrade Junos OS to a release that includes the fix (21.2R3\u2011S10 or later, 21.4R3\u2011S12 or later, etc.).", "If an immediate upgrade is not feasible, apply the workaround by disabling the SIP ALG on the affected device: \"set security alg sip disable\" or enforce a firewall filter that blocks SIP traffic over TCP.", "Additionally, restrict any remaining SIP traffic to UDP only or block UDP SIP traffic if it is not needed for operational requirements."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service through flow management process crash"}, "threat_synthesis": {"affected_systems": "The flaw affects Juniper Networks Junos OS running on SRX Series and MX Series routers equipped with MX\u2011SPC3 or MS\u2011MPC service cards. All releases prior to the specific patch milestones\u201421.2R3\u2011S10, 21.4R3\u2011S12, 22.4R3\u2011S8, 23.2R2\u2011S5, 23.4R2\u2011S6, 24.2R2\u2011S3, 24.4R2\u2011S1, 25.2R1\u2011S1, and 25.2R2\u2014are vulnerable.", "description_and_impact": "A vulnerability in the SIP application layer gateway of Juniper Junos OS allows an unauthenticated, network\u2011based attacker to send specially crafted SIP messages over TCP that cause the SIP ALG to enter an infinite loop, resulting in a crash of the flowd or mspmand process and disabling the device\u2019s ability to route traffic. This denial of service can interrupt critical services that rely on SRX or MX routers and is triggered by malformed SIP headers that are repeatedly parsed until a watchdog timer forces a restart.", "risk_and_exploitability": "The CVSS score of 8.7 signals a high\u2011severity attack, yet the EPSS score of less than 1% indicates that mature, automated exploitation is unlikely at present. The vulnerability is not present in the CISA KEV catalog, suggesting no confirmed exploitation in the wild. Nevertheless, its vulnerability can be leveraged by any unauthenticated actor on the network able to transmit TCP SIP traffic, potentially causing widespread outages in environments that rely on these routing platforms."}}}}, "created": "2026-01-16T13:43:14.642043+00:00", "updated": "2026-04-18T06:00:08.518852+00:00", "vendors": ["juniper_networks", "juniper_networks$PRODUCT$junos_os"]}