CVE-2009-1891

N/A Unknown
Published: July 10, 2009 Modified: April 23, 2026
View on NVD

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).

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

Login to generate AI explanation

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534712
Source: secalert@redhat.com
Exploit
http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
Source: secalert@redhat.com
Broken Link Mailing List
http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00006.html
Source: secalert@redhat.com
Mailing List Third Party Advisory
http://marc.info/?l=apache-httpd-dev&m=124621326524824&w=2
Source: secalert@redhat.com
Exploit Issue Tracking Mailing List Third Party Advisory
http://marc.info/?l=apache-httpd-dev&m=124661528519546&w=2
Source: secalert@redhat.com
Issue Tracking Mailing List Third Party Advisory
http://marc.info/?l=bugtraq&m=129190899612998&w=2
Source: secalert@redhat.com
Issue Tracking Mailing List Third Party Advisory
http://marc.info/?l=bugtraq&m=130497311408250&w=2
Source: secalert@redhat.com
Issue Tracking Mailing List Third Party Advisory
http://osvdb.org/55782
Source: secalert@redhat.com
Broken Link
http://secunia.com/advisories/35721
Source: secalert@redhat.com
Not Applicable Vendor Advisory
http://secunia.com/advisories/35781
Source: secalert@redhat.com
Not Applicable Vendor Advisory
http://secunia.com/advisories/35793
Source: secalert@redhat.com
Not Applicable Vendor Advisory
http://secunia.com/advisories/35865
Source: secalert@redhat.com
Not Applicable Vendor Advisory
http://secunia.com/advisories/37152
Source: secalert@redhat.com
Not Applicable Vendor Advisory
http://secunia.com/advisories/37221
Source: secalert@redhat.com
Not Applicable Vendor Advisory
http://security.gentoo.org/glsa/glsa-200907-04.xml
Source: secalert@redhat.com
Third Party Advisory
http://support.apple.com/kb/HT3937
Source: secalert@redhat.com
Broken Link
http://wiki.rpath.com/Advisories:rPSA-2009-0142
Source: secalert@redhat.com
Broken Link
http://wiki.rpath.com/wiki/Advisories:rPSA-2009-0142
Source: secalert@redhat.com
Broken Link
http://www-01.ibm.com/support/docview.wss?uid=swg1PK91361
Source: secalert@redhat.com
Third Party Advisory
http://www-01.ibm.com/support/docview.wss?uid=swg1PK99480
Source: secalert@redhat.com
Third Party Advisory
http://www.debian.org/security/2009/dsa-1834
Source: secalert@redhat.com
Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2009:149
Source: secalert@redhat.com
Broken Link Patch
http://www.redhat.com/support/errata/RHSA-2009-1156.html
Source: secalert@redhat.com
Third Party Advisory
http://www.securityfocus.com/archive/1/507857/100/0/threaded
Source: secalert@redhat.com
Third Party Advisory VDB Entry
http://www.securitytracker.com/id?1022529
Source: secalert@redhat.com
Broken Link Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/USN-802-1
Source: secalert@redhat.com
Third Party Advisory
http://www.vupen.com/english/advisories/2009/1841
Source: secalert@redhat.com
Permissions Required Vendor Advisory
http://www.vupen.com/english/advisories/2009/3184
Source: secalert@redhat.com
Permissions Required Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=509125
Source: secalert@redhat.com
Issue Tracking Patch Third Party Advisory
https://lists.apache.org/thread.html/54a42d4b01968df1117cea77fc53d6beb931c0e05936ad02af93e9ac%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/5df9bfb86a3b054bb985a45ff9250b0332c9ecc181eec232489e7f79%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/r0276683d8e1e07153fc8642618830ac0ade85b9ae0dc7b07f63bb8fc%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/r2cb985de917e7da0848c440535f65a247754db8b2154a10089e4247b%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/r5f9c22f9c28adbd9f00556059edc7b03a5d5bb71d4bb80257c0d34e4%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/r7dd6be4dc38148704f2edafb44a8712abaa3a2be120d6c3314d55919%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/r84d043c2115176958562133d96d851495d712aa49da155d81f6733be%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/r8828e649175df56f1f9e3919938ac7826128525426e2748f0ab62feb%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/r9e8622254184645bc963a1d47c5d47f6d5a36d6f080d8d2c43b2b142%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/rb9c9f42dafa25d2f669dac2a536a03f2575bc5ec1be6f480618aee10%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/rc4c53a0d57b2771ecd4b965010580db355e38137c8711311ee1073a8%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
Source: secalert@redhat.com
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12361
Source: secalert@redhat.com
Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8632
Source: secalert@redhat.com
Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9248
Source: secalert@redhat.com
Third Party Advisory
https://rhn.redhat.com/errata/RHSA-2009-1148.html
Source: secalert@redhat.com
Third Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg01363.html
Source: secalert@redhat.com
Mailing List Third Party Advisory
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534712
Source: af854a3a-2127-422b-91ae-364da2661108
Exploit
http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html
Source: af854a3a-2127-422b-91ae-364da2661108
Broken Link Mailing List
http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00006.html
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List Third Party Advisory
http://marc.info/?l=apache-httpd-dev&m=124621326524824&w=2
Source: af854a3a-2127-422b-91ae-364da2661108
Exploit Issue Tracking Mailing List Third Party Advisory
http://marc.info/?l=apache-httpd-dev&m=124661528519546&w=2
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking Mailing List Third Party Advisory
http://marc.info/?l=bugtraq&m=129190899612998&w=2
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking Mailing List Third Party Advisory
http://marc.info/?l=bugtraq&m=130497311408250&w=2
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking Mailing List Third Party Advisory
http://osvdb.org/55782
Source: af854a3a-2127-422b-91ae-364da2661108
Broken Link
http://secunia.com/advisories/35721
Source: af854a3a-2127-422b-91ae-364da2661108
Not Applicable Vendor Advisory
http://secunia.com/advisories/35781
Source: af854a3a-2127-422b-91ae-364da2661108
Not Applicable Vendor Advisory
http://secunia.com/advisories/35793
Source: af854a3a-2127-422b-91ae-364da2661108
Not Applicable Vendor Advisory
http://secunia.com/advisories/35865
Source: af854a3a-2127-422b-91ae-364da2661108
Not Applicable Vendor Advisory
http://secunia.com/advisories/37152
Source: af854a3a-2127-422b-91ae-364da2661108
Not Applicable Vendor Advisory
http://secunia.com/advisories/37221
Source: af854a3a-2127-422b-91ae-364da2661108
Not Applicable Vendor Advisory
http://security.gentoo.org/glsa/glsa-200907-04.xml
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://support.apple.com/kb/HT3937
Source: af854a3a-2127-422b-91ae-364da2661108
Broken Link
http://wiki.rpath.com/Advisories:rPSA-2009-0142
Source: af854a3a-2127-422b-91ae-364da2661108
Broken Link
http://wiki.rpath.com/wiki/Advisories:rPSA-2009-0142
Source: af854a3a-2127-422b-91ae-364da2661108
Broken Link
http://www-01.ibm.com/support/docview.wss?uid=swg1PK91361
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www-01.ibm.com/support/docview.wss?uid=swg1PK99480
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.debian.org/security/2009/dsa-1834
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2009:149
Source: af854a3a-2127-422b-91ae-364da2661108
Broken Link Patch
http://www.redhat.com/support/errata/RHSA-2009-1156.html
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.securityfocus.com/archive/1/507857/100/0/threaded
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory VDB Entry
http://www.securitytracker.com/id?1022529
Source: af854a3a-2127-422b-91ae-364da2661108
Broken Link Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/USN-802-1
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
http://www.vupen.com/english/advisories/2009/1841
Source: af854a3a-2127-422b-91ae-364da2661108
Permissions Required Vendor Advisory
http://www.vupen.com/english/advisories/2009/3184
Source: af854a3a-2127-422b-91ae-364da2661108
Permissions Required Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=509125
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking Patch Third Party Advisory
https://lists.apache.org/thread.html/54a42d4b01968df1117cea77fc53d6beb931c0e05936ad02af93e9ac%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/5df9bfb86a3b054bb985a45ff9250b0332c9ecc181eec232489e7f79%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/r0276683d8e1e07153fc8642618830ac0ade85b9ae0dc7b07f63bb8fc%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/r2cb985de917e7da0848c440535f65a247754db8b2154a10089e4247b%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/r5f9c22f9c28adbd9f00556059edc7b03a5d5bb71d4bb80257c0d34e4%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/r7dd6be4dc38148704f2edafb44a8712abaa3a2be120d6c3314d55919%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/r84d043c2115176958562133d96d851495d712aa49da155d81f6733be%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/r8828e649175df56f1f9e3919938ac7826128525426e2748f0ab62feb%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/r9e8622254184645bc963a1d47c5d47f6d5a36d6f080d8d2c43b2b142%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/rb9c9f42dafa25d2f669dac2a536a03f2575bc5ec1be6f480618aee10%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/rc4c53a0d57b2771ecd4b965010580db355e38137c8711311ee1073a8%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12361
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8632
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9248
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://rhn.redhat.com/errata/RHSA-2009-1148.html
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://www.redhat.com/archives/fedora-package-announce/2009-August/msg01363.html
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List Third Party Advisory

110 reference(s) from NVD

Quick Stats

CVSS v3 Score
N/A / 10.0
EPSS (Exploit Probability)
18.8%
95th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-400

Affected Vendors

debian fedoraproject apache canonical redhat

Related CVEs

CVE-2026-7069 8.0
CVE-2026-7068 8.8
CVE-2026-7067 7.3
CVE-2026-7066 7.3
CVE-2026-7065 7.3