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CVE-2022-2255

19
FAUCET Score

CVE-2022-2255 describes a vulnerability in mod_wsgi where the X-Client-IP header is not properly removed from requests originating from untrusted proxies, allowing an attacker to inject this header into the target WSGI application. This affects various Debian Linux and mod_wsgi versions. The vulnerability has a CVSS score of 7.5 (HIGH), indicating a network-based attack with low complexity and a high impact on integrity, though confidentiality and availability are not affected. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.9.3CPE matchmatch criteria
cpe:2.3:a:modwsgi:mod_wsgi:*:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.69%
Probability of exploitation in next 30 days
EPSS Percentile
49.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0069 is in the 25th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

microsoftpatch availablevia msrc
Product: cbl2 mod_wsgi 4.9.3-2 on CBL Mariner 2.0Fixed in: 4.9.3-2
microsoftpatch availablevia msrc
Product: 19492-16823Fixed in: 4.9.3-2
pippatch availablevia ghsa
Product: mod-wsgiFixed in: 4.9.3
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: python39:3.9-8100020250430153343.d47b87a4
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mod_wsgi
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: python38:3.8/mod_wsgi
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: mod_wsgi
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-python38-mod_wsgi

Vendor Advisories (3)

pipGHSA-7527-8855-9cf8high

Incorrect header handling in mod-wsgi

Aug 26, 2022
microsoft2022-Aug/CVE-2022-2255Important

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.

Aug 9, 2022
redhatCVE-2022-2255Moderate

mod_wsgi: Trusted Proxy Headers Removing Bypass

Jul 18, 2022

References

github.com / GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c
ExploitThird Party Advisory
github.com / GrahamDumpleton/mod_wsgi/blob/4.9.2/src/server/mod_wsgi.c
ExploitThird Party Advisory
lists.debian.org / debian-lts-announce/2022/09/msg00021.html
Mailing ListThird Party Advisory
modwsgi.readthedocs.io / en/latest/release-notes/version-4.9.3.html
Release NotesThird Party Advisory