How severe is CVE-2011-0989?

CVE-2011-0989 has a CVSS 2.0 base score of 5.8, rated medium severity.

Is CVE-2011-0989 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-0989?

CVE-2011-0989 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-2011-0989?

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

When was CVE-2011-0989 published?

CVE-2011-0989 was published on 2011-04-13 and last updated on 2026-06-16.

CVE-2011-0989

CVE-2011-0989 is a medium-severity vulnerability in Mono with a CVSS 2.0 base score of 5.8. 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-264.

Key facts

Severity: Medium (CVSS 2.0 base score 5.8)
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Mono
Published: 2011-04-13
Last modified: 2026-06-16

Description

The RuntimeHelpers.InitializeArray method in metadata/icall.c in Mono, when Moonlight 2.x before 2.4.1 or 3.x before 3.99.3 is used, does not properly restrict data types, which allows remote attackers to modify internal read-only data structures, and cause a denial of service (plugin crash) or corrupt the internal state of the security manager, via a crafted media file, as demonstrated by modifying a C# struct.

Frequently asked questions

What is CVE-2011-0989?: The RuntimeHelpers.InitializeArray method in metadata/icall.c in Mono, when Moonlight 2.x before 2.4.1 or 3.x before 3.99.3 is used, does not properly restrict data types, which allows remote attackers to modify internal read-only data structures, and cause a denial of service (plugin crash) or corrupt the internal state of the security manager, via a crafted media file, as demonstrated by modifying a C# struct.
How severe is CVE-2011-0989?: CVE-2011-0989 has a CVSS 2.0 base score of 5.8, rated medium severity.
Is CVE-2011-0989 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-0989?: CVE-2011-0989 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-2011-0989?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-0989 published?: CVE-2011-0989 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:*:*:*:*:*:*:*

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