Unrated severityNVD Advisory· Published Dec 16, 2021· Updated Nov 3, 2025
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.
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Affected products
2- Suricata/Suricatadescription
Patches
Vulnerability mechanics
References
4- forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942mitrex_refsource_MISC
- github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97dfmitrex_refsource_MISC
- github.com/OISF/suricata/releasesmitrex_refsource_MISC
- redmine.openinfosecfoundation.org/issues/4710mitrex_refsource_MISC
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