The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn…

Description

The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564.

Scores

EPSS (exploitation in 30 days)

53.0% · top 1.0% of all CVEs (7 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

• n/a
• CWE-776 (opens in a new tab)All about CWE-776 and its CVEs

Affected products

• n/a

  • affected n/a

References (60)

• 35487 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• DSA-1812 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• http://www.apache.org/dist/apr/CHANGES-APR-UTIL-1.3 (opens in a new tab)x_refsource_CONFIRMx_transferred
• ADV-2009-1907 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• FEDORA-2009-5969 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• 35444 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• [apr-dev] 20090602 [PATCH] prevent "billion laughs" attack against expat (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• MDVSA-2009:131 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
• oval:org.mitre.oval:def:10270 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
• 35360 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• ADV-2010-1107 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• [oss-security] 20090603 CVE request: "billion laughs" attack against Apache APR (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• 35395 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• PK99478 (opens in a new tab)vendor-advisoryx_refsource_AIXAPARx_transferred
• 20090824 rPSA-2009-0123-1 apr-util (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• SUSE-SR:2010:011 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• 35284 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• PK91241 (opens in a new tab)vendor-advisoryx_refsource_AIXAPARx_transferred
• 36473 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• PK88342 (opens in a new tab)vendor-advisoryx_refsource_AIXAPARx_transferred
• 35843 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• FEDORA-2009-6014 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• RHSA-2009:1108 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• HPSBUX02612 (opens in a new tab)vendor-advisoryx_refsource_HPx_transferred
• oval:org.mitre.oval:def:12473 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
• 35797 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html (opens in a new tab)x_refsource_CONFIRMx_transferred
• GLSA-200907-03 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
• http://svn.apache.org/viewvc?view=rev&revision=781403 (opens in a new tab)x_refsource_CONFIRMx_transferred
• FEDORA-2009-6261 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• USN-786-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• 34724 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 37221 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 35565 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• ADV-2009-3184 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• http://wiki.rpath.com/Advisories:rPSA-2009-0123 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 8842 (opens in a new tab)exploitx_refsource_EXPLOIT-DBx_transferred
• SSA:2009-167-02 (opens in a new tab)vendor-advisoryx_refsource_SLACKWAREx_transferred
• http://www-01.ibm.com/support/docview.wss?uid=swg27014463 (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
• MDVSA-2013:150 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
• 35710 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 35253 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• RHSA-2009:1107 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• http://support.apple.com/kb/HT3937 (opens in a new tab)x_refsource_CONFIRMx_transferred
• USN-787-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_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: 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 [6/13] - /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 [6/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ (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] 20210606 svn commit: r1075467 [2/2] - 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-2009-1955](https://trackcve.app/badge/CVE-2009-1955.svg)](https://trackcve.app/cve/CVE-2009-1955)

Record last updated 7 Aug 2024, 05:36 UTC.