CVE-2021-45098
suricata - security update
7.5
HIGH
CVSS 3.1
EPSS 0.40%
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.
How to fix CVE-2021-45098
To remediate CVE-2021-45098, upgrade the affected package to a fixed version below.
- —upgrade to 1:6.0.1-3+deb11u1 or later
- —upgrade to 1:6.0.1-3+deb11u1 or later
Is CVE-2021-45098 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1:6.0.1-3+deb11u1
- from 0, < 1:6.0.1-3+deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |