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

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).

Scores

EPSS (exploitation in 30 days)

17.1% · top 2.9% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Weakness

• n/a
• CWE-400 (opens in a new tab)All about CWE-400 and its CVEs

Affected products

• n/a

  • affected n/a

References (55)

• [apache-httpd-dev] 20090628 mod_deflate DoS (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• FEDORA-2009-8812 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• SUSE-SA:2009:050 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• http://wiki.rpath.com/wiki/Advisories:rPSA-2009-0142 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 35781 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• PK99480 (opens in a new tab)vendor-advisoryx_refsource_AIXAPARx_transferred
• oval:org.mitre.oval:def:12361 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
• MDVSA-2009:149 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
• PK91361 (opens in a new tab)vendor-advisoryx_refsource_AIXAPARx_transferred
• SSRT090208 (opens in a new tab)vendor-advisoryx_refsource_HPx_transferred
• RHSA-2009:1156 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• 35865 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• ADV-2009-1841 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• 37152 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 1022529 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
• [apache-httpd-dev] 20090703 Re: mod_deflate DoS (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• DSA-1834 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• 20091113 rPSA-2009-0142-2 httpd mod_ssl (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• oval:org.mitre.oval:def:8632 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
• HPSBUX02612 (opens in a new tab)vendor-advisoryx_refsource_HPx_transferred
• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534712 (opens in a new tab)x_refsource_MISCx_transferred
• GLSA-200907-04 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
• http://wiki.rpath.com/Advisories:rPSA-2009-0142 (opens in a new tab)x_refsource_CONFIRMx_transferred
• RHSA-2009:1148 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• oval:org.mitre.oval:def:9248 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
• USN-802-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• 37221 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• ADV-2009-3184 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• 35793 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• https://bugzilla.redhat.com/show_bug.cgi?id=509125 (opens in a new tab)x_refsource_CONFIRMx_transferred
• APPLE-SA-2009-11-09-1 (opens in a new tab)vendor-advisoryx_refsource_APPLEx_transferred
• 35721 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• http://support.apple.com/kb/HT3937 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 55782 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
• [httpd-cvs] 20190815 svn commit: r1048742 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20190815 svn commit: r1048743 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20190815 svn commit: r1048743 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20190815 svn commit: r1048742 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20200401 svn commit: r1058586 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20200401 svn commit: r1058586 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20200401 svn commit: r1058587 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20200401 svn commit: r1058587 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1888194 [5/13] - /httpd/site/trunk/content/security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073140 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073139 [5/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073140 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073143 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073146 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073149 [6/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210603 svn commit: r1075360 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210603 svn commit: r1075360 [1/3] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210606 svn commit: r1075467 [1/2] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210606 svn commit: r1075470 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2009-1891](https://trackcve.app/badge/CVE-2009-1891.svg)](https://trackcve.app/cve/CVE-2009-1891)

Record last updated 7 Aug 2024, 05:27 UTC.