CVE-2022-25763: Improper input validation on HTTP/2 headers

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-08-10 · updated 2026-06-17
Weakness: CWE-444

Description

Improper Input Validation vulnerability in HTTP/2 request validation of Apache Traffic Server allows an attacker to create smuggle or cache poison attacks. This issue affects Apache Traffic Server 8.0.0 to 9.1.2.

Affected products

Apache Software Foundation Apache Traffic Server: from 8.0.0 before 8.1.5; from 9.0.0 before 9.1.3 — fixed in 8.1.5, 9.1.3
Debian Linux: 11.0
Fedoraproject Fedora: 35, 36

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Traffic Server 8.1.5, 9.1.3. Check the vendor advisory for mitigations.

References

https://lists.apache.org/thread/rc64lwbdgrkv674koc3zl1sljr9vwg21
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CJ67IWD5PRJUOIYIDJRUG3UMS2UF4X4J/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZCSBQBYPOZSWS5LCOAQ6LJLRLXFIAW5A/
https://www.debian.org/security/2022/dsa-5206
https://lists.apache.org/thread/rc64lwbdgrkv674koc3zl1sljr9vwg21
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CJ67IWD5PRJUOIYIDJRUG3UMS2UF4X4J/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZCSBQBYPOZSWS5LCOAQ6LJLRLXFIAW5A/
https://www.debian.org/security/2022/dsa-5206

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