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CVE-2011-0991

20
FAUCET Score

CVE-2011-0991 describes a use-after-free vulnerability in Mono, specifically impacting Moonlight 2.x before 2.4.1 and 3.x before 3.99.3. This flaw allows remote attackers to trigger a denial of service or potentially other unspecified impacts through manipulating DynamicMethod instances. With a CVSS score of 6.8 (medium severity), it requires medium attack complexity and could lead to partial confidentiality, integrity, and availability compromise. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:mono:mono:*:*:*:*:*:*:*:*
2.0CPE matchmatch criteria
cpe:2.3:a:novell:moonlight:2.0:*:*:*:*:*:*:*
2.3.0CPE matchmatch criteria
cpe:2.3:a:novell:moonlight:2.3.0:*:*:*:*:*:*:*
2.4CPE matchmatch criteria
cpe:2.3:a:novell:moonlight:2.4:*:*:*:*:*:*:*
2.31CPE matchmatch criteria
cpe:2.3:a:novell:moonlight:2.31:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.8MEDIUM

AV:N/AC:M/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.93%
Probability of exploitation in next 30 days
EPSS Percentile
85.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0293 is in the 78th percentile among its peer group of 19,956 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

lists.opensuse.org / opensuse-updates/2011-04/msg00024.html
openwall.com / lists/oss-security/2011/04/06/14
Patch
bugzilla.novell.com / show_bug.cgi
bugzilla.novell.com / show_bug.cgi
Patch
secunia.com / advisories/44002
Vendor Advisory
secunia.com / advisories/44076
Vendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/66626
github.com / mono/mono/commit/3f8ee42b8c867d9a4c18c22657840d072cca5c3a
Patch
github.com / mono/mono/commit/89d1455a80ef13cddee5d79ec00c06055da3085c
Patch
github.com / mono/mono/commit/8eb1189099e02372fd45ca1c67230eccf1edddc0
Patch
mono-project.com / Vulnerabilities
Vendor Advisory
securityfocus.com / bid/47208
vupen.com / english/advisories/2011/0904
Vendor Advisory