CVE-2021-45098

{"containers": {"cna": {"affected": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "descriptions": [{"lang": "en", "value": "An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options of the md5header from the client side. After the three-way handshake, it's possible to inject an RST ACK with a random TCP md5header option. Then, the client can send an HTTP GET request with a forbidden URL. The server will ignore the RST ACK and send the response HTTP packet for the client's request. These packets will not trigger a Suricata reject action."}], "problemTypes": [{"descriptions": [{"description": "n/a", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-12-16T04:07:57.000Z", "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://github.com/OISF/suricata/releases"}, {"tags": ["x_refsource_MISC"], "url": "https://redmine.openinfosecfoundation.org/issues/4710"}, {"tags": ["x_refsource_MISC"], "url": "https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve@mitre.org", "ID": "CVE-2021-45098", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "n/a", "version": {"version_data": [{"version_value": "n/a"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options of the md5header from the client side. After the three-way handshake, it's possible to inject an RST ACK with a random TCP md5header option. Then, the client can send an HTTP GET request with a forbidden URL. The server will ignore the RST ACK and send the response HTTP packet for the client's request. These packets will not trigger a Suricata reject action."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "n/a"}]}]}, "references": {"reference_data": [{"name": "https://github.com/OISF/suricata/releases", "refsource": "MISC", "url": "https://github.com/OISF/suricata/releases"}, {"name": "https://redmine.openinfosecfoundation.org/issues/4710", "refsource": "MISC", "url": "https://redmine.openinfosecfoundation.org/issues/4710"}, {"name": "https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942", "refsource": "MISC", "url": "https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942"}, {"name": "https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df", "refsource": "MISC", "url": "https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df"}]}}}, "adp": [{"title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/OISF/suricata/releases"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://redmine.openinfosecfoundation.org/issues/4710"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00029.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:26:34.251Z"}}]}, "cveMetadata": {"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "cveId": "CVE-2021-45098", "datePublished": "2021-12-16T04:07:57.000Z", "dateReserved": "2021-12-16T00:00:00.000Z", "dateUpdated": "2025-11-03T19:26:34.251Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.2"}

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:oisf:suricata:*:*:*:*:*:*:*:*", "matchCriteriaId": "58D90161-8343-4EB0-BF64-2EEFFABDCEE6", "versionEndExcluding": "6.0.4", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252", "vulnerable": true}, {"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73", "vulnerable": true}, {"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options of the md5header from the client side. After the three-way handshake, it's possible to inject an RST ACK with a random TCP md5header option. Then, the client can send an HTTP GET request with a forbidden URL. The server will ignore the RST ACK and send the response HTTP packet for the client's request. These packets will not trigger a Suricata reject action."}, {"lang": "es", "value": "Se ha detectado un problema en Suricata versiones anteriores a 6.0.4. Es posible omitir/evadir cualquier firma basada en HTTP al falsificar un paquete RST TCP con opciones TCP aleatorias del md5header desde el lado del cliente. Despu\u00e9s del handshake de tres v\u00edas, es posible inyectar un RST ACK con una opci\u00f3n TCP md5header aleatoria. Entonces, el cliente puede enviar una petici\u00f3n HTTP GET con una URL prohibida. El servidor ignorar\u00e1 el RST ACK y enviar\u00e1 el paquete HTTP de respuesta para la petici\u00f3n del cliente. Estos paquetes no desencadenar\u00e1n una acci\u00f3n de rechazo de Suricata"}], "id": "CVE-2021-45098", "lastModified": "2026-06-17T04:13:10.223", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-12-16T05:15:08.727", "references": [{"source": "cve@mitre.org", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942"}, {"source": "cve@mitre.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df"}, {"source": "cve@mitre.org", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/OISF/suricata/releases"}, {"source": "cve@mitre.org", "tags": ["Exploit", "Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://redmine.openinfosecfoundation.org/issues/4710"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://github.com/OISF/suricata/releases"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00029.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://redmine.openinfosecfoundation.org/issues/4710"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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