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.

Published: 2011-04-13 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-0991 is rated Moderate Risk (56.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.71%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-0991

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-05-18 3.15% 2.71% -0.44%
2 2025-03-30 4.14% 3.15% -0.98%
3 2025-03-29 — 4.14% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-0991

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2011-0991

OS Trackers for CVE-2011-0991

vendor priority summary link
debian unimportant CVE-2011-0991 unimportant priority: Debian including 1 source packages (mono), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-0991
gentoo high CVE-2011-0991: 1 GLSA(s) (201206-13), 2 atom(s) (dev-lang/mono, dev-util/mono-debugger); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2011-0991
ubuntu negligible CVE-2011-0991 negligible priority: Ubuntu including 1 source packages (mono), 11 status rows across 11 suites (dapper, hardy, karmic, lucid, maverick, natty, oneiric, precise, quantal, raring, upstream): ignored 6, not-affected 4, released 1. https://ubuntu.com/security/CVE-2011-0991

Affected software / configurations for CVE-2011-0991

Vendor Product Version Raw CPE
mono mono — cpe:2.3:a:mono:mono:*:*:*:*:*:*:*:*
novell moonlight 2.0 cpe:2.3:a:novell:moonlight:2.0:*:*:*:*:*:*:*
novell moonlight 2.3.0 cpe:2.3:a:novell:moonlight:2.3.0:*:*:*:*:*:*:*
novell moonlight 2.4 cpe:2.3:a:novell:moonlight:2.4:*:*:*:*:*:*:*
novell moonlight 2.31 cpe:2.3:a:novell:moonlight:2.31:*:*:*:*:*:*:*
novell moonlight 3.0 cpe:2.3:a:novell:moonlight:3.0:*:*:*:*:*:*:*
novell moonlight 3.99 cpe:2.3:a:novell:moonlight:3.99:*:*:*:*:*:*:*

References for CVE-2011-0991

URL Tags
http://lists.opensuse.org/opensuse-updates/2011-04/msg00024.html
http://openwall.com/lists/oss-security/2011/04/06/14 Patch
http://secunia.com/advisories/44002 Vendor Advisory
http://secunia.com/advisories/44076 Vendor Advisory
http://www.mono-project.com/Vulnerabilities Vendor Advisory
http://www.securityfocus.com/bid/47208
http://www.vupen.com/english/advisories/2011/0904 Vendor Advisory
https://bugzilla.novell.com/show_bug.cgi?id=660422
https://bugzilla.novell.com/show_bug.cgi?id=667077 Patch
https://exchange.xforce.ibmcloud.com/vulnerabilities/66626
https://github.com/mono/mono/commit/3f8ee42b8c867d9a4c18c22657840d072cca5c3a Patch
https://github.com/mono/mono/commit/89d1455a80ef13cddee5d79ec00c06055da3085c Patch
https://github.com/mono/mono/commit/8eb1189099e02372fd45ca1c67230eccf1edddc0 Patch
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