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CVE-2021-45098

7.5 · HIGH

An issue was discovered in Suricata before 6.0.4.

Published Dec 16, 2021EPSS 1.96%

Overview

CVE-2021-45098 is a high-severity vulnerability. It was published on December 16, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refforum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942GitHubgithub.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97dfGitHubgithub.com/OISF/suricata/releasesRefredmine.openinfosecfoundation.org/issues/4710Refforum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942GitHubgithub.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97dfGitHubgithub.com/OISF/suricata/releasesReflists.debian.org/debian-lts-announce/2025/03/msg00029.htmlRefredmine.openinfosecfoundation.org/issues/4710

How CyberStrike helps

Frequently asked questions

What is CVE-2021-45098?

CVE-2021-45098 is a high-severity vulnerability. It was published on December 16, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-45098?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-45098?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-45098?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-45098 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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