Home/CVE/The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion even after the associa
CVE

CVE-2009-1891

The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion even after the associa

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).

HIGH · CVSS 7.1 EPSS 0.18846
Act now
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 5% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0

Weakness Classification

Affected Products & Versions

10
apache http server>= 2.0.35 and < 2.0.64
apache http server>= 2.2.0 and < 2.2.12
debian linuxall versions

Public Exploits & PoCs

1

Scoring & Timeline

7.1
HIGH · CVSS v2 (legacy) · secalert@redhat.com
View on NVD
This CVE predates CVSS v3; the legacy v2 score is shown so triage still has a severity to work with.
v2 Vector
AV:N/AC:M/Au:N/C:N/I:N/A:C
Published to NVD10 Jul 2009 · 03:30 PM

Vendor Advisories

9
suse-csafopenSUSE-SU-2024:10268-1
rhsaRHSA-2010:0602Moderate
rhsaRHSA-2009:1580Moderate
rhsaRHSA-2009:1205Moderate
rhsaRHSA-2009:1156Important
🔗

References & Sources

54
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://marc.info/?l=apache-httpd-dev&m=124621326524824&w=2ExploitIssue TrackingMailing ListThird Party Advisory
http://marc.info/?l=apache-httpd-dev&m=124661528519546&w=2Issue TrackingMailing ListThird Party Advisory
http://marc.info/?l=bugtraq&m=129190899612998&w=2Issue TrackingMailing ListThird Party Advisory
http://marc.info/?l=bugtraq&m=130497311408250&w=2Issue TrackingMailing ListThird Party Advisory
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