CVE-2009-1955
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.
Official description from the CVE record, published by mitre. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org
Key data
EPSS
Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
- Score
- 0.52988 (53.0% probability)
- Percentile
- 99.0%
- Scores of
- Nov 10, 2026
- Model
- v2026.06.15
References
Links listed in the CVE record. They lead to other sites, which CubePath does not control.
- 35487 (secunia.com)third-party-advisory
- DSA-1812 (debian.org)vendor-advisory
- apache.org/dist/apr/CHANGES-APR-UTIL-1.3
- ADV-2009-1907 (vupen.com)vdb-entry
- FEDORA-2009-5969 (redhat.com)vendor-advisory
- 35444 (secunia.com)third-party-advisory
- [apr-dev] 20090602 [PATCH] prevent "billion laughs" attack against expat (marc.info)mailing-list
- MDVSA-2009:131 (mandriva.com)vendor-advisory
- oval:org.mitre.oval:def:10270 (oval.cisecurity.org)vdb-entrysignature
- 35360 (secunia.com)third-party-advisory
- ADV-2010-1107 (vupen.com)vdb-entry
- [oss-security] 20090603 CVE request: "billion laughs" attack against Apache APR (openwall.com)mailing-list
- 35395 (secunia.com)third-party-advisory
- PK99478 (www-01.ibm.com)vendor-advisory
- 20090824 rPSA-2009-0123-1 apr-util (securityfocus.com)mailing-list
- SUSE-SR:2010:011 (lists.opensuse.org)vendor-advisory
- 35284 (secunia.com)third-party-advisory
- PK91241 (www-01.ibm.com)vendor-advisory
- 36473 (secunia.com)third-party-advisory
- PK88342 (www-01.ibm.com)vendor-advisory
- 35843 (secunia.com)third-party-advisory
- FEDORA-2009-6014 (redhat.com)vendor-advisory
- RHSA-2009:1108 (redhat.com)vendor-advisory
- HPSBUX02612 (marc.info)vendor-advisory
- oval:org.mitre.oval:def:12473 (oval.cisecurity.org)vdb-entrysignature
- 35797 (secunia.com)third-party-advisory
- oracle.com/technetwork/topics/security/cpuapr2013-1899555.h…
- GLSA-200907-03 (security.gentoo.org)vendor-advisory
- svn.apache.org/viewvc?view=rev&revision=781403
- FEDORA-2009-6261 (redhat.com)vendor-advisory
- USN-786-1 (ubuntu.com)vendor-advisory
- 34724 (secunia.com)third-party-advisory
- 37221 (secunia.com)third-party-advisory
- 35565 (secunia.com)third-party-advisory
- ADV-2009-3184 (vupen.com)vdb-entry
- wiki.rpath.com/Advisories:rPSA-2009-0123
- 8842 (exploit-db.com)exploit
- SSA:2009-167-02 (slackware.com)vendor-advisory
- www-01.ibm.com/support/docview.wss?uid=swg27014463
- APPLE-SA-2009-11-09-1 (lists.apple.com)vendor-advisory
- MDVSA-2013:150 (mandriva.com)vendor-advisory
- 35710 (secunia.com)third-party-advisory
- 35253 (securityfocus.com)vdb-entry
- RHSA-2009:1107 (redhat.com)vendor-advisory
- support.apple.com/kb/HT3937
- USN-787-1 (ubuntu.com)vendor-advisory
- [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 (lists.apache.org)mailing-list
- [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 (lists.apache.org)mailing-list
- [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 (lists.apache.org)mailing-list
- [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 (lists.apache.org)mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ (lists.apache.org)mailing-list
- [httpd-cvs] 20210330 svn commit: r1888194 [6/13] - /httpd/site/trunk/content/security/json/ (lists.apache.org)mailing-list
- [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 (lists.apache.org)mailing-list
- [httpd-cvs] 20210330 svn commit: r1073139 [6/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ (lists.apache.org)mailing-list
- [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 (lists.apache.org)mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ (lists.apache.org)mailing-list
- [httpd-cvs] 20210330 svn commit: r1073149 [6/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ (lists.apache.org)mailing-list
- [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 (lists.apache.org)mailing-list
- [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 (lists.apache.org)mailing-list
- [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 (lists.apache.org)mailing-list
Timeline
- ID reserved
- Record published
- Record last updated
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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:49 UTC. Sources and licenses