What’s Vulnerable › Vulnerabilities

CVE-2022-2255

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-08-25 · updated 2026-06-17
• Weakness: CWE-348

Description

A vulnerability was found in mod_wsgi. The X-Client-IP header is not removed from a request from an untrusted proxy, allowing an attacker to pass the X-Client-IP header to the target WSGI application because the condition to remove it is missing.

Affected products

• Debian Linux: 10.0
• mod_wsgi: before 4.9.3 — fixed in 4.9.3

How to fix

Upgrade to a fixed version: mod_wsgi 4.9.3. Check the vendor advisory for mitigations.

References

• https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L13940-L13941
• https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L14046-L14082
• https://lists.debian.org/debian-lts-announce/2022/09/msg00021.html
• https://modwsgi.readthedocs.io/en/latest/release-notes/version-4.9.3.html
• https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L13940-L13941
• https://github.com/GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c#L14046-L14082
• https://lists.debian.org/debian-lts-announce/2022/09/msg00021.html
• https://modwsgi.readthedocs.io/en/latest/release-notes/version-4.9.3.html

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