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TI-2009-01802 Aliases CVE-2009-1891GHSA-hwvh-jv6j-6p3p

The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until…

Priority MEDIUM 48CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Medium
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Complete
Fix status
Fixed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-400.

Summary

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).

Why it matters now

EPSS 0.17111 97th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Fixed Red Hat: 7 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 14

CPEVersionsRoleVendor
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*2.0.35 to before 2.0.64; 2.2.0 to before 2.2.12VulnerableApache
cpe:2.3:o:debian:debian_linux:4.0:*:*:*:*:*:*:*4.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:*5.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*6.0VulnerableDebian
cpe:2.3:o:fedoraproject:fedora:11:*:*:*:*:*:*:*11VulnerableFedoraproject
cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:*:*:*:*6.06VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:-:*:*:*8.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:8.10:*:*:*:*:*:*:*8.10VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:9.04:*:*:*:*:*:*:*9.04VulnerableCanonical
cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:*5.0VulnerableRed Hat
  • cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* Versions 2.0.35 to before 2.0.64; 2.2.0 to before 2.2.12 Vulnerable ·Apache
  • cpe:2.3:o:debian:debian_linux:4.0:*:*:*:*:*:*:* Versions 4.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Debian
  • cpe:2.3:o:fedoraproject:fedora:11:*:*:*:*:*:*:* Versions 11 Vulnerable ·Fedoraproject
  • cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:*:*:*:* Versions 6.06 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:-:*:*:* Versions 8.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:8.10:*:*:*:*:*:*:* Versions 8.10 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:9.04:*:*:*:*:*:*:* Versions 9.04 Vulnerable ·Canonical
  • cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Red Hat
Show 4 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:redhat:enterprise_linux_eus:5.3:*:*:*:*:*:*:*5.3VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:*5.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:5.3:*:*:*:*:*:*:*5.3VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:*5.0VulnerableRed Hat
  • cpe:2.3:o:redhat:enterprise_linux_eus:5.3:*:*:*:*:*:*:* Versions 5.3 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:5.3:*:*:*:*:*:*:* Versions 5.3 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Red Hat

Remediation

Red Hat 7 advisories

  • RHSA-2010:0602 Released 2010-08-04 · Red Hat rating Moderate
    Red Hat Certificate System 7.3 security update
    • Red Hat Certificate System 7.3 for 4AS ant-1.6.5-1jpp_1rh, avalon-logkit-1.2-2jpp_4rh, axis-1.2.1-1jpp_3rh +39
    • Red Hat Certificate System 7.3 for 4ES ant-1.6.5-1jpp_1rh, avalon-logkit-1.2-2jpp_4rh, axis-1.2.1-1jpp_3rh +39
  • RHSA-2009:1580 Released 2009-11-11 · Red Hat rating Moderate
    httpd security update
    • Red Hat Enterprise Linux AS version 4 httpd-2.0.52-41.ent.6, httpd-2.0.52-41.ent.6.i386, httpd-2.0.52-41.ent.6.ia64 +17
    • Red Hat Enterprise Linux Desktop version 4 httpd-2.0.52-41.ent.6, httpd-2.0.52-41.ent.6.i386, httpd-devel-2.0.52-41.ent.6 +7
    • Red Hat Enterprise Linux ES version 4 httpd-2.0.52-41.ent.6, httpd-2.0.52-41.ent.6.i386, httpd-2.0.52-41.ent.6.ia64 +12
    • Red Hat Enterprise Linux WS version 4 httpd-2.0.52-41.ent.6, httpd-2.0.52-41.ent.6.i386, httpd-2.0.52-41.ent.6.ia64 +12
  • RHSA-2009:1205 Released 2009-08-10 · Red Hat rating Moderate
    httpd security and bug fix update
    • Red Hat Desktop version 3 httpd-2.0.46-75.ent, httpd-2.0.46-75.ent.i386, httpd-devel-2.0.46-75.ent +3
    • Red Hat Enterprise Linux AS version 3 httpd-2.0.46-75.ent, httpd-2.0.46-75.ent.i386, httpd-2.0.46-75.ent.ia64 +9
    • Red Hat Enterprise Linux ES version 3 httpd-2.0.46-75.ent, httpd-2.0.46-75.ent.i386, httpd-2.0.46-75.ent.ia64 +6
    • Red Hat Enterprise Linux WS version 3 httpd-2.0.46-75.ent, httpd-2.0.46-75.ent.i386, httpd-2.0.46-75.ent.ia64 +6
Show 4 more Red Hat advisories
  • RHSA-2009:1160 Released 2009-07-17 · Red Hat rating Important
    httpd22 security update
    • Red Hat JBoss Web Server 1.0 for RHEL 4 AS httpd22-2.2.10-23.1.ep5.el4, httpd22-2.2.10-23.1.ep5.el4.i386, httpd22-apr-2.2.10-23.1.ep5.el4 +11
    • Red Hat JBoss Web Server 1.0 for RHEL 4 ES httpd22-2.2.10-23.1.ep5.el4, httpd22-2.2.10-23.1.ep5.el4.i386, httpd22-apr-2.2.10-23.1.ep5.el4 +11
  • RHSA-2009:1156 Released 2009-07-14 · Red Hat rating Important
    httpd security update
    • Red Hat Application Stack v2 for Enterprise Linux (v.5) httpd-2.2.11-3.el5s2, httpd-2.2.11-3.el5s2.i386, httpd-devel-2.2.11-3.el5s2 +5
  • RHSA-2009:1155 Released 2009-07-14 · Red Hat rating Important
    httpd security update
    • Red Hat JBoss Enterprise Web Server 1 for RHEL 5 Server httpd-2.2.10-10.ep5.el5, httpd-2.2.10-10.ep5.el5.i386, httpd-devel-2.2.10-10.ep5.el5 +5
  • RHSA-2009:1148 Released 2009-07-09 · Red Hat rating Important
    httpd security update
    • Red Hat Enterprise Linux (v. 5 server) httpd-2.2.3-22.el5_3.2, httpd-2.2.3-22.el5_3.2.i386, httpd-2.2.3-22.el5_3.2.ia64 +13
    • Red Hat Enterprise Linux Desktop (v. 5 client) httpd-2.2.3-22.el5_3.2, httpd-2.2.3-22.el5_3.2.i386, mod_ssl-1:2.2.3-22.el5_3.2 +1
    • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) httpd-2.2.3-22.el5_3.2, httpd-devel-2.2.3-22.el5_3.2, httpd-devel-2.2.3-22.el5_3.2.i386 +2

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Certificate System 7.3 for 4ASFixed RHSA-2010:0602
Red Hat Certificate System 7.3 for 4ESFixed RHSA-2010:0602
Red Hat Desktop version 3Fixed RHSA-2009:1205
Red Hat Enterprise Linux (v. 5 server)Fixed RHSA-2009:1148
Red Hat Enterprise Linux AS version 3Fixed RHSA-2009:1205
Red Hat Enterprise Linux AS version 4Fixed RHSA-2009:1580
Red Hat Enterprise Linux Desktop (v. 5 client)Fixed RHSA-2009:1148
Red Hat Enterprise Linux Desktop Workstation (v. 5 client)Fixed RHSA-2009:1148
Red Hat Enterprise Linux Desktop version 4Fixed RHSA-2009:1580
Red Hat Enterprise Linux ES version 3Fixed RHSA-2009:1205
Red Hat Enterprise Linux ES version 4Fixed RHSA-2009:1580
Red Hat Enterprise Linux WS version 3Fixed RHSA-2009:1205
Red Hat Enterprise Linux WS version 4Fixed RHSA-2009:1580
Red Hat JBoss Enterprise Web Server 1 for RHEL 5 ServerFixed RHSA-2009:1155
Red Hat JBoss Web Server 1.0 for RHEL 4 ASFixed RHSA-2009:1160
Red Hat JBoss Web Server 1.0 for RHEL 4 ESFixed RHSA-2009:1160

Timeline

  1. 2026-10-02 Threatist record created from CVE-2009-1891
  2. 2026-10-03 Alias added: GHSA-hwvh-jv6j-6p3p

References

Exploit 2

Patch 2

Advisory 18

Other 25

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences