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CVE-2009-1955

7.5 · HIGH

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 t…

Published Jun 8, 2009apacheCWE-776EPSS 52.99%

Overview

CVE-2009-1955 is a high-severity vulnerability affecting apache apr-util. It was published on June 8, 2009 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from apache. Update apr-util to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
apacheapr-util>= 0, < 1.3.7Affected
applemac_os_x>= 0, < 10.6.2Affected
apachehttp_server>= 2.2.0, < 2.2.12Affected

References

Reflists.apple.com/archives/security-announce/2009/Nov/msg00000.htmlReflists.opensuse.org/opensuse-security-announce/2010-05/msg00001.htmlRefmarc.info/?l=apr-dev&m=124396021826125&w=2Refmarc.info/?l=bugtraq&m=129190899612998&w=2Refsecunia.com/advisories/34724Refsecunia.com/advisories/35284Refsecunia.com/advisories/35360Refsecunia.com/advisories/35395Refsecunia.com/advisories/35444Refsecunia.com/advisories/35487

How CyberStrike helps

Frequently asked questions

What is CVE-2009-1955?

CVE-2009-1955 is a high-severity vulnerability affecting apache apr-util. It was published on June 8, 2009 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2009-1955?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-1955?

Check the references section for vendor advisories and patches from apache. Update apr-util to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-1955?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-1955 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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