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CVE-2021-45098

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published12/16/2021

Last Modified11/3/2025

Sourcenvd

Honeypot Sightings0

Affected Products

debian:debian_linuxoisf:suricata

References

https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942(cve@mitre.org)

https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df(cve@mitre.org)

https://github.com/OISF/suricata/releases(cve@mitre.org)

https://redmine.openinfosecfoundation.org/issues/4710(cve@mitre.org)

https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/OISF/suricata/releases(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2025/03/msg00029.html(af854a3a-2127-422b-91ae-364da2661108)

https://redmine.openinfosecfoundation.org/issues/4710(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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