CVE-2023-36841

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This results in consuming all resources and a manual restart is needed to recover.</p><p>This issue affects interfaces with PPPoE configured and tcp-mss enabled.</p><p>This issue affects Juniper Networks Junos OS</p><p></p><ul><li>All versions prior to 20.4R3-S7;</li><li>21.1 version 21.1R1 and later versions;</li><li>21.2 versions prior to 21.2R3-S6;</li><li>21.3 versions prior to 21.3R3-S5;</li><li>21.4 versions prior to 21.4R3-S3;</li><li>22.1 versions prior to 22.1R3-S4;</li><li>22.2 versions prior to 22.2R3;</li><li>22.3 versions prior to 22.3R2-S2;</li><li>22.4 versions prior to 22.4R2;</li></ul><p></p>\n\n"}], "value": "\nAn Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on MX Series allows a unauthenticated network-based attacker to cause an infinite loop, resulting in a Denial of Service (DoS).\n\nAn attacker who sends malformed TCP traffic via an interface configured with PPPoE, causes an infinite loop on the respective PFE. This results in consuming all resources and a manual restart is needed to recover.\n\nThis issue affects interfaces with PPPoE configured and tcp-mss enabled.\n\nThis issue affects Juniper Networks Junos OS\n\n\n\n * All versions prior to 20.4R3-S7;\n * 21.1 version 21.1R1 and later versions;\n * 21.2 versions prior to 21.2R3-S6;\n * 21.3 versions prior to 21.3R3-S5;\n * 21.4 versions prior to 21.4R3-S3;\n * 22.1 versions prior to 22.1R3-S4;\n * 22.2 versions prior to 22.2R3;\n * 22.3 versions prior to 22.3R2-S2;\n * 22.4 versions prior to 22.4R2;\n\n\n\n\n\n\n"}], "exploits": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Juniper SIRT is not aware of any malicious exploitation of this vulnerability.</p>"}], "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\n\n"}], "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"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "description": " CWE-400: Uncontrolled Resource Consumption", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper", "dateUpdated": "2023-10-12T22:58:14.922Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://supportportal.juniper.net/JSA73172"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>The following software releases have been updated to resolve this specific issue: Junos OS 20.4R3-S7, 21.2R3-S6, 21.4R3-S3, 22.1R3-S4, 22.2R3, 22.3R2-S2, 22.3R3, 22.4R2, 23.2R1, and all subsequent releases.</p>"}], "value": "The following software releases have been updated to resolve this specific issue: Junos OS 20.4R3-S7, 21.2R3-S6, 21.4R3-S3, 22.1R3-S4, 22.2R3, 22.3R2-S2, 22.3R3, 22.4R2, 23.2R1, and all subsequent releases.\n\n"}], "source": {"advisory": "JSA73172", "defect": ["1707742"], "discovery": "USER"}, "timeline": [{"lang": "en", "time": "2023-10-11T16:00:00.000Z", "value": "Initial Publication"}], "title": "Junos OS: MX Series: Receipt of malformed TCP traffic will cause a Denial of Service", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>There are no known workarounds for this issue.</p>"}], "value": "There are no known workarounds for this issue.\n\n"}], "x_generator": {"engine": "Vulnogram 0.1.0-av217"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T17:01:09.926Z"}, "title": "CVE Program Container", "references": [{"tags": ["vendor-advisory", "x_transferred"], "url": "https://supportportal.juniper.net/JSA73172"}]}, {"affected": [{"vendor": "juniper_networks", "product": "junos_os", "cpes": ["cpe:2.3:o:juniper_networks:junos_os:*:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "versions": [{"version": "0", "status": "affected", "lessThan": "20.4r3-s7", "versionType": "semver"}, {"version": "21.1r1", "status": "affected", "lessThan": "21.1", "versionType": "semver"}, {"version": "21.2", "status": "affected", "lessThan": "21.2r3-s6", "versionType": "semver"}, {"version": "21.3", "status": "affected", "lessThan": "21.3r3-s5", "versionType": "semver"}, {"version": "21.4", "status": "affected", "lessThan": "21.4r3-s3", "versionType": "semver"}, {"version": "22.1", "status": "affected", "lessThan": "22.1r3-s4", "versionType": "semver"}, {"version": "22.2", "status": "affected", "lessThan": "22.2r3", "versionType": "semver"}, {"version": "22.3", "status": "affected", "lessThan": "22.3r2-s2", "versionType": "semver"}, {"version": "22.3", "status": "affected", "lessThan": "22.3r3", "versionType": "semver"}, {"version": "22.4", "status": "affected", "lessThan": "22.4r2", "versionType": "semver"}]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-09-18T17:54:47.892619Z", "id": "CVE-2023-36841", "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": "2024-09-18T18:01:47.921Z"}}]}}

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Junos OS on MX Series allows a unauthenticated network-based attacker to cause an infinite loop, resulting in a Denial of Service (DoS).\n\nAn attacker who sends malformed TCP traffic via an interface configured with PPPoE, causes an infinite loop on the respective PFE. This results in consuming all resources and a manual restart is needed to recover.\n\nThis issue affects interfaces with PPPoE configured and tcp-mss enabled.\n\nThis issue affects Juniper Networks Junos OS\n\n\n\n * All versions prior to 20.4R3-S7;\n * 21.1 version 21.1R1 and later versions;\n * 21.2 versions prior to 21.2R3-S6;\n * 21.3 versions prior to 21.3R3-S5;\n * 21.4 versions prior to 21.4R3-S3;\n * 22.1 versions prior to 22.1R3-S4;\n * 22.2 versions prior to 22.2R3;\n * 22.3 versions prior to 22.3R2-S2;\n * 22.4 versions prior to 22.4R2;\n\n\n\n\n\n\n", "supportingMedia": [{"type": "text/html", "value": "\n\n<p>An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on MX Series allows a unauthenticated network-based attacker to cause an infinite loop, resulting in a Denial of Service (DoS).</p><p>An attacker who sends malformed TCP traffic via an interface configured with PPPoE, causes an infinite loop on the respective PFE. This results in consuming all resources and a manual restart is needed to recover.</p><p>This issue affects interfaces with PPPoE configured and tcp-mss enabled.</p><p>This issue affects Juniper Networks Junos OS</p><p></p><ul><li>All versions prior to 20.4R3-S7;</li><li>21.1 version 21.1R1 and later versions;</li><li>21.2 versions prior to 21.2R3-S6;</li><li>21.3 versions prior to 21.3R3-S5;</li><li>21.4 versions prior to 21.4R3-S3;</li><li>22.1 versions prior to 22.1R3-S4;</li><li>22.2 versions prior to 22.2R3;</li><li>22.3 versions prior to 22.3R2-S2;</li><li>22.4 versions prior to 22.4R2;</li></ul><p></p>\n\n", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-400", "description": " CWE-400: Uncontrolled Resource Consumption"}]}], "configurations": [{"lang": "en", "value": "PPPoE can be configured with the following commands:\n\n [ edit interfaces interface-name ]\n [ encapsulation ppp-over-ether; ]tcp-mss can be enabled with the following command:\n\n [ tcp-mss mss-value; ]", "supportingMedia": [{"type": "text/html", "value": "<p>PPPoE can be configured with the following commands:</p> <tt>[ edit interfaces interface-name ]<br></tt><tt> [ encapsulation ppp-over-ether; ]</tt><p>tcp-mss can be enabled with the following command:</p> <tt>[ tcp-mss mss-value; ]</tt>", "base64": false}]}], "providerMetadata": {"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper", "dateUpdated": "2023-10-12T22:58:14.922Z"}}}, "cveMetadata": {"cveId": "CVE-2023-36841", "state": "PUBLISHED", "dateUpdated": "2024-09-18T18:01:47.921Z", "dateReserved": "2023-06-27T16:17:25.276Z", "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "datePublished": "2023-10-12T22:58:14.922Z", "assignerShortName": "juniper"}, "dataVersion": "5.1"}

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This results in consuming all resources and a manual restart is needed to recover.\n\nThis issue affects interfaces with PPPoE configured and tcp-mss enabled.\n\nThis issue affects Juniper Networks Junos OS\n\n\n\n * All versions prior to 20.4R3-S7;\n * 21.1 version 21.1R1 and later versions;\n * 21.2 versions prior to 21.2R3-S6;\n * 21.3 versions prior to 21.3R3-S5;\n * 21.4 versions prior to 21.4R3-S3;\n * 22.1 versions prior to 22.1R3-S4;\n * 22.2 versions prior to 22.2R3;\n * 22.3 versions prior to 22.3R2-S2;\n * 22.4 versions prior to 22.4R2;\n\n\n\n\n\n\n"}, {"lang": "es", "value": "Una verificaci\u00f3n inadecuada de la vulnerabilidad de condiciones inusuales o excepcionales en Packet Forwarding Engine (pfe) de Juniper Networks Junos OS en la serie MX permite que un atacante basado en red no autenticado provoque un bucle infinito, lo que resulta en una Denegaci\u00f3n de Servicio (DoS). Un atacante que env\u00eda tr\u00e1fico TCP con formato incorrecto a trav\u00e9s de una interfaz configurada con PPPoE provoca un bucle infinito en el PFE respectivo. Esto da como resultado el consumo de todos los recursos y es necesario un reinicio manual para recuperarse. Este problema afecta a las interfaces con PPPoE configurado y tcp-mss habilitado. Este problema afecta a Juniper Networks Junos OS * Todas las versiones anteriores a 20.4R3-S7; * 21.1 versi\u00f3n 21.1R1 y versiones posteriores; * Versiones 21.2 anteriores a 21.2R3-S6; * Versiones 21.3 anteriores a 21.3R3-S5; * Versiones 21.4 anteriores a 21.4R3-S3; * Versiones 22.1 anteriores a 22.1R3-S4; * Versiones 22.2 anteriores a 22.2R3; * Versiones 22.3 anteriores a 22.3R2-S2; * Versiones 22.4 anteriores a 22.4R2;"}], "id": "CVE-2023-36841", "lastModified": "2026-06-17T06:07:12.020", "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"}, {"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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-36841", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-18T17:54:47.892619Z", "version": "2.0.3"}}]}, "published": "2023-10-12T23:15:10.967", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA73172"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA73172"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "sirt@juniper.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-400"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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