How severe is CVE-2011-0991?

CVE-2011-0991 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2011-0991 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-0991?

CVE-2011-0991 primarily affects Mono. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-0991?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-0991 published?

CVE-2011-0991 was published on 2011-04-13 and last updated on 2026-06-16.

CVE-2011-0991

CVE-2011-0991 is a medium-severity vulnerability in Mono with a CVSS 2.0 base score of 6.8. 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-399.

Key facts

Severity: Medium (CVSS 2.0 base score 6.8)
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Mono
Published: 2011-04-13
Last modified: 2026-06-16

Description

Use-after-free vulnerability in Mono, when Moonlight 2.x before 2.4.1 or 3.x before 3.99.3 is used, allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors related to finalizing and then resurrecting a DynamicMethod instance.

Frequently asked questions

What is CVE-2011-0991?: Use-after-free vulnerability in Mono, when Moonlight 2.x before 2.4.1 or 3.x before 3.99.3 is used, allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors related to finalizing and then resurrecting a DynamicMethod instance.
How severe is CVE-2011-0991?: CVE-2011-0991 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2011-0991 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-0991?: CVE-2011-0991 primarily affects Mono. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-0991?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-0991 published?: CVE-2011-0991 was published on 2011-04-13 and last updated on 2026-06-16.

References

Affected products (7)

cpe:2.3:a:mono:mono:*:*:*:*:*:*:*:*
cpe:2.3:a:novell:moonlight:2.0:*:*:*:*:*:*:*
cpe:2.3:a:novell:moonlight:2.3.0:*:*:*:*:*:*:*
cpe:2.3:a:novell:moonlight:2.4:*:*:*:*:*:*:*
cpe:2.3:a:novell:moonlight:2.31:*:*:*:*:*:*:*
cpe:2.3:a:novell:moonlight:3.0:*:*:*:*:*:*:*
cpe:2.3:a:novell:moonlight:3.99:*:*:*:*:*:*:*

More vulnerabilities in Mono

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CVE-2006-5072 — Medium (CVSS 6.2): The System.CodeDom.Compiler classes in Novell Mono create temporary files with insecure permissions, which allows local…
CVE-2011-0992 — Medium (CVSS 5.8): Use-after-free vulnerability in Mono, when Moonlight 2.x before 2.4.1 or 3.x before 3.99.3 is used, allows remote…
CVE-2011-0990 — Medium (CVSS 5.8): Race condition in the FastCopy optimization in the Array.Copy method in metadata/icall.c in Mono, when Moonlight 2.x…

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Other CWE-399 (Resource Management Errors) vulnerabilities

CVE-2015-8104 — Critical (CVSS 10.0): The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a…
CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
CVE-2014-0560 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Reader and Acrobat 10.x before 10.1.12 and 11.x before 11.0.09 on Windows and OS…

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