CVE-2011-2516

CVE-2011-2516 is a medium-severity vulnerability in Apache Xml Security For C++ with a CVSS 2.0 base score of 5.0. 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 XML signature feature in Apache XML Security for C++ 1.6.0, as used in Shibboleth before 2.4.3 and possibly other products, allows remote attackers to cause a denial of service (crash) via a signature using a large RSA key, which triggers a buffer overflow.

Frequently asked questions

What is CVE-2011-2516?
Off-by-one error in the XML signature feature in Apache XML Security for C++ 1.6.0, as used in Shibboleth before 2.4.3 and possibly other products, allows remote attackers to cause a denial of service (crash) via a signature using a large RSA key, which triggers a buffer overflow.
How severe is CVE-2011-2516?
CVE-2011-2516 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-2516 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-2516?
CVE-2011-2516 primarily affects Apache Xml Security For C++. In total, 16 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-2516?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-2516 published?
CVE-2011-2516 was published on 2011-07-11 and last updated on 2026-06-16.

References

Affected products (16)

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