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CVE-2011-2939

5.1 · MEDIUM

Off-by-one error in the decode_xs function in Unicode/Unicode.xs in the Encode module before 2.44, as used in Perl before 5.15.6, might allow context-dependent attackers to cause a denial of servic…

Published Jan 13, 2012dan_kogaiCWE-189EPSS 2.56%

Overview

CVE-2011-2939 is a medium-severity vulnerability affecting dan_kogai encode_module. It was published on January 13, 2012 and has a CVSS 2.0 base score of 5.1 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 5.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Off-by-one error in the decode_xs function in Unicode/Unicode.xs in the Encode module before 2.44, as used in Perl before 5.15.6, might allow context-dependent attackers to cause a denial of service (memory corruption) via a crafted Unicode string, which triggers a heap-based buffer overflow.

Remediation

Check the references section for vendor advisories and patches from dan_kogai. Update encode_module 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
dan_kogaiencode_module0Affected
perlperl0Affected

References

Refcpansearch.perl.org/src/FLORA/perl-5.14.2/pod/perldelta.podRefperl5.git.perl.org/perl.git/commitdiff/e46d973584785af1f445c4dedbee4243419cb860#patch5Refsearch.cpan.org/~flora/perl-5.14.2/pod/perldelta.pod#Encode_decode_xs_n-byte_heap-overflow_%28CVE-2011-2939%29Refsecunia.com/advisories/46172Refsecunia.com/advisories/46989Refsecunia.com/advisories/51457Refsecunia.com/advisories/55314Refwww.mandriva.com/security/advisories?name=MDVSA-2012:008Refwww.openwall.com/lists/oss-security/2011/08/18/8Refwww.openwall.com/lists/oss-security/2011/08/19/17

How CyberStrike helps

Frequently asked questions

What is CVE-2011-2939?

CVE-2011-2939 is a medium-severity vulnerability affecting dan_kogai encode_module. It was published on January 13, 2012 and has a CVSS 2.0 base score of 5.1 (MEDIUM).

How severe is CVE-2011-2939?

This vulnerability has a CVSS 2.0 base score of 5.1, 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-2011-2939?

Check the references section for vendor advisories and patches from dan_kogai. Update encode_module 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-2011-2939?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2011-2939 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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