Is CVE-2009-1955 being actively exploited?

CVE-2009-1955 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2009-1955?

CVE-2009-1955 has a CVSS 3.1 base score of 7.5 (HIGH).

CVE-2009-1955

HIGH · CVSS 7.5EPSS 53.0%EU EUVD

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.

Key facts

CVSS score: 7.5 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-776
EPSS score: 53.0% (99th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2009-1950)
Published: June 8, 2009
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-1950 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

apache / apr-util
apache / http server
apple / mac os x
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
debian / debian linux
fedoraproject / fedora
fedoraproject / fedora
fedoraproject / fedora
oracle / http server
suse / linux enterprise server

Certified products that may be affected

4 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Apple Mac OS X 10.6 - Apple Inc. - Common Criteria BSI-DSZ-CC-0536-2010 - archived
SUSE Linux Enterprise Server Version 9 with Service Pack 2, ProPack 4 for Service Pack 2 and certification-sles-sgi-eal3 package - SUSE Linux Products Gmbh - Common Criteria BSI-DSZ-CC-0292-2005 - archived
SuSE Linux Enterprise Server Version 9 with certification-sles-ibm-eal4 package - SUSE Linux Products Gmbh - Common Criteria BSI-DSZ-CC-0256-2005 - archived
Apple Mac OS X v10.3.6 and Apple Mac OS X Server V10.3.6 - Apple Inc. - Common Criteria CCEVS-VR-0086-2005 - archived

References

http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html(Mailing List, Third Party Advisory)
http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html(Mailing List, Third Party Advisory)
http://marc.info/?l=apr-dev&m=124396021826125&w=2(Mailing List, Patch)
http://marc.info/?l=bugtraq&m=129190899612998&w=2(Mailing List)
http://secunia.com/advisories/34724(Broken Link, Third Party Advisory)
http://secunia.com/advisories/35284(Broken Link, Third Party Advisory)
http://secunia.com/advisories/35360(Broken Link, Third Party Advisory)
http://secunia.com/advisories/35395(Broken Link, Third Party Advisory)
http://secunia.com/advisories/35444(Broken Link, Third Party Advisory)
http://secunia.com/advisories/35487(Broken Link, Third Party Advisory)
http://secunia.com/advisories/35565(Broken Link, Third Party Advisory)
http://secunia.com/advisories/35710(Broken Link, Third Party Advisory)
http://secunia.com/advisories/35797(Broken Link, Third Party Advisory)
http://secunia.com/advisories/35843(Broken Link, Third Party Advisory)
http://secunia.com/advisories/36473(Broken Link, Third Party Advisory)
http://secunia.com/advisories/37221(Broken Link, Third Party Advisory)
http://security.gentoo.org/glsa/glsa-200907-03.xml(Third Party Advisory)
http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.538210(Broken Link, Third Party Advisory)
http://support.apple.com/kb/HT3937(Broken Link)
http://svn.apache.org/viewvc?view=rev&revision=781403(Patch)
http://wiki.rpath.com/Advisories:rPSA-2009-0123(Broken Link)
http://www-01.ibm.com/support/docview.wss?uid=swg1PK88342(Broken Link)
http://www-01.ibm.com/support/docview.wss?uid=swg1PK91241(Broken Link, Third Party Advisory)
http://www-01.ibm.com/support/docview.wss?uid=swg1PK99478(Broken Link, Third Party Advisory)
http://www-01.ibm.com/support/docview.wss?uid=swg27014463(Broken Link, Third Party Advisory)
http://www.apache.org/dist/apr/CHANGES-APR-UTIL-1.3(Broken Link)
http://www.debian.org/security/2009/dsa-1812(Mailing List, Third Party Advisory)
http://www.mandriva.com/security/advisories?name=MDVSA-2009:131(Broken Link, Third Party Advisory)
http://www.mandriva.com/security/advisories?name=MDVSA-2013:150(Broken Link, Third Party Advisory)
http://www.openwall.com/lists/oss-security/2009/06/03/4(Mailing List)
http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html(Patch, Third Party Advisory)
http://www.redhat.com/support/errata/RHSA-2009-1107.html(Broken Link, Third Party Advisory)
http://www.redhat.com/support/errata/RHSA-2009-1108.html(Broken Link, Third Party Advisory)
http://www.securityfocus.com/archive/1/506053/100/0/threaded(Broken Link, Third Party Advisory, VDB Entry)
http://www.securityfocus.com/bid/35253(Broken Link, Third Party Advisory, VDB Entry)
http://www.ubuntu.com/usn/usn-786-1(Third Party Advisory)
http://www.ubuntu.com/usn/usn-787-1(Third Party Advisory)
http://www.vupen.com/english/advisories/2009/1907(Broken Link, Third Party Advisory)
http://www.vupen.com/english/advisories/2009/3184(Broken Link, Third Party Advisory)
http://www.vupen.com/english/advisories/2010/1107(Broken Link, Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain