How severe is CVE-2011-2012?

CVE-2011-2012 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2011-2012 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-2012?

CVE-2011-2012 primarily affects Microsoft Forefront Unified Access Gateway. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-2012?

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

When was CVE-2011-2012 published?

CVE-2011-2012 was published on 2011-10-12 and last updated on 2026-06-16.

CVE-2011-2012

CVE-2011-2012 is a medium-severity vulnerability in Microsoft Forefront Unified Access Gateway with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Microsoft Forefront Unified Access Gateway
Published: 2011-10-12
Last modified: 2026-06-16

Description

Microsoft Forefront Unified Access Gateway (UAG) 2010 Gold, Update 1, Update 2, and SP1 does not properly validate session cookies, which allows remote attackers to cause a denial of service (IIS outage) via unspecified network traffic, aka "Null Session Cookie Crash."

Frequently asked questions

What is CVE-2011-2012?: Microsoft Forefront Unified Access Gateway (UAG) 2010 Gold, Update 1, Update 2, and SP1 does not properly validate session cookies, which allows remote attackers to cause a denial of service (IIS outage) via unspecified network traffic, aka "Null Session Cookie Crash."
How severe is CVE-2011-2012?: CVE-2011-2012 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-2012 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-2012?: CVE-2011-2012 primarily affects Microsoft Forefront Unified Access Gateway. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-2012?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-2012 published?: CVE-2011-2012 was published on 2011-10-12 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:a:microsoft:forefront_unified_access_gateway:2010:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:forefront_unified_access_gateway:2010:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:forefront_unified_access_gateway:2010:update1:*:*:*:*:*:*
cpe:2.3:a:microsoft:forefront_unified_access_gateway:2010:update2:*:*:*:*:*:*

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