High severity7.5NVD Advisory· Published Dec 16, 2021· Updated Jun 17, 2026
CVE-2021-45098
CVE-2021-45098
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
6- Suricata/Suricatadescription
Patches
Vulnerability mechanics
References
5- github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97dfnvdPatchThird Party Advisory
- redmine.openinfosecfoundation.org/issues/4710nvdExploitIssue TrackingPatchVendor Advisory
- forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942nvdRelease NotesVendor Advisory
- github.com/OISF/suricata/releasesnvdRelease NotesThird Party Advisory
- lists.debian.org/debian-lts-announce/2025/03/msg00029.htmlnvd
News mentions
0No linked articles in our index yet.