CVE-2011-2939

CVE-2011-2939 is a medium-severity vulnerability in Dan Kogai Encode Module with a CVSS 2.0 base score of 5.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-189.

Key facts

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.

Frequently asked questions

What is CVE-2011-2939?
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.
How severe is CVE-2011-2939?
CVE-2011-2939 has a CVSS 2.0 base score of 5.1, rated medium severity.
Is CVE-2011-2939 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-2939?
CVE-2011-2939 primarily affects Dan Kogai Encode Module. In total, 176 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-2939?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-2939 published?
CVE-2011-2939 was published on 2012-01-13 and last updated on 2026-06-16.

References

Affected products (176)

Other CWE-189 (Numeric Errors) vulnerabilities

Browse all CWE-189 (Numeric Errors) vulnerabilities →