{"id":"CVE-2021-45098","state":"PUBLISHED","title":"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 ","description":"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.","publishedAt":"2021-12-16T04:07:57.000Z","updatedAt":"2025-11-03T19:26:34.251Z","severity":null,"assigner":"mitre","products":["n/a n/a"],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":["https://github.com/OISF/suricata/releases","https://redmine.openinfosecfoundation.org/issues/4710","https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942","https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df","https://lists.debian.org/debian-lts-announce/2025/03/msg00029.html"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:13.309Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/45xxx/CVE-2021-45098.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-45098","state":"PUBLISHED","datePublished":"2021-12-16T04:07:57.000Z","dateUpdated":"2025-11-03T19:26:34.251Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2021-12-16T00:00:00.000Z"},"containers":{"cna":{"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."}],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":[{"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","tags":["x_refsource_MISC"]}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"mitre","dateUpdated":"2021-12-16T04:07:57.000Z","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca"},"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":[{"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","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00029.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T19:26:34.251Z"}}]}}}