Is CVE-2011-2516 in the CISA KEV catalog?

No. CVE-2011-2516 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-2516?

CVE-2011-2516 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2011-2516?

CVE-2011-2516 has an EPSS score of 7.72% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-2516?

Upgrade xml-security-c on debian 11 to 1.6.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2011-2516

MEDIUMEPSS 94th pctl

5.0

CVSS v2

NVD

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.

CWE-189

How to fix

Remediation Available

xml-security-cDebian

Fixed in:1.6.1-1CVE-2011-2516

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

7.72%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Exploit1

issues.apache.org

Vendor Advisory4

Other references11

Related Vulnerabilities

Other CWE-189 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-1538	High	10.0	99%	-	-
CVE-2006-3747	High	7.6	96%	-	Fix
CVE-2007-0071	High	9.3	93%	-	-
CVE-2015-3829	High	10.0	90%	-	-
CVE-2015-3864	High	10.0	87%	-	-
CVE-2015-1539	High	10.0	86%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.