CVEvulnerability
CVE-2021-45098
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-12-16
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CVSS 2.0 ([email protected])
- 5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:P/A:N
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.
Affected configurations
• oisf suricata (< 6.0.4)
• debian debian linux 9.0
• debian debian linux 10.0
• debian debian linux 11.0
References
- https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942 Release Notes, Vendor Advisory
- https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df Patch, Third Party Advisory
- https://github.com/OISF/suricata/releases Release Notes, Third Party Advisory
- https://redmine.openinfosecfoundation.org/issues/4710 Exploit, Issue Tracking, Patch, Vendor Advisory
- https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942 Release Notes, Vendor Advisory
- https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df Patch, Third Party Advisory
- https://github.com/OISF/suricata/releases Release Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/03/msg00029.html lists.debian.org
- https://redmine.openinfosecfoundation.org/issues/4710 Exploit, Issue Tracking, Patch, Vendor Advisory