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CVE-2009-3560

5.0 · MEDIUM

The big2_toUtf8 function in lib/xmltok.c in libexpat in Expat 2.0.1, as used in the XML-Twig module for Perl, allows context-dependent attackers to cause a denial of service (application crash) via…

Published Dec 4, 2009libexpat_projectCWE-119EPSS 24.31%

Overview

CVE-2009-3560 is a medium-severity vulnerability affecting libexpat_project libexpat. It was published on December 4, 2009 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The big2_toUtf8 function in lib/xmltok.c in libexpat in Expat 2.0.1, as used in the XML-Twig module for Perl, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with malformed UTF-8 sequences that trigger a buffer over-read, related to the doProlog function in lib/xmlparse.c, a different vulnerability than CVE-2009-2625 and CVE-2009-3720.

Remediation

Check the references section for vendor advisories and patches from libexpat_project. Update libexpat 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
apachehttp_server>= 2.0.35, < 2.0.64Affected

References

Refexpat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmlparse.c?r1=1.164&r2=1.165Refexpat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmlparse.c?view=log#rev1.165Reflists.opensuse.org/opensuse-security-announce/2010-01/msg00007.htmlReflists.opensuse.org/opensuse-security-announce/2010-05/msg00001.htmlReflists.opensuse.org/opensuse-security-announce/2010-05/msg00002.htmlReflists.opensuse.org/opensuse-security-announce/2010-06/msg00001.htmlReflists.opensuse.org/opensuse-security-announce/2010-08/msg00001.htmlReflists.vmware.com/pipermail/security-announce/2010/000082.htmlRefmail.python.org/pipermail/expat-bugs/2009-November/002846.htmlRefmarc.info/?l=bugtraq&m=130168502603566&w=2

How CyberStrike helps

Frequently asked questions

What is CVE-2009-3560?

CVE-2009-3560 is a medium-severity vulnerability affecting libexpat_project libexpat. It was published on December 4, 2009 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

How severe is CVE-2009-3560?

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-3560?

Check the references section for vendor advisories and patches from libexpat_project. Update libexpat 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-2009-3560?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-3560 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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