How severe is CVE-2015-1638?

CVE-2015-1638 has a CVSS 2.0 base score of 5.8, rated medium severity.

Is CVE-2015-1638 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-1638?

CVE-2015-1638 primarily affects Microsoft Windows Server 2012. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-1638?

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

When was CVE-2015-1638 published?

CVE-2015-1638 was published on 2015-04-14 and last updated on 2026-06-17.

CVE-2015-1638

CVE-2015-1638 is a medium-severity vulnerability in Microsoft Windows Server 2012 with a CVSS 2.0 base score of 5.8. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-264.

Key facts

Severity: Medium (CVSS 2.0 base score 5.8)
EPSS exploit prediction: 13% (96th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Microsoft Windows Server 2012
Published: 2015-04-14
Last modified: 2026-06-17

Description

Microsoft Active Directory Federation Services (AD FS) 3.0 on Windows Server 2012 R2 does not properly handle logoff actions, which allows remote attackers to bypass intended access restrictions by leveraging an unattended workstation, aka "Active Directory Federation Services Information Disclosure Vulnerability."

Frequently asked questions

What is CVE-2015-1638?: Microsoft Active Directory Federation Services (AD FS) 3.0 on Windows Server 2012 R2 does not properly handle logoff actions, which allows remote attackers to bypass intended access restrictions by leveraging an unattended workstation, aka "Active Directory Federation Services Information Disclosure Vulnerability."
How severe is CVE-2015-1638?: CVE-2015-1638 has a CVSS 2.0 base score of 5.8, rated medium severity.
Is CVE-2015-1638 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-1638?: CVE-2015-1638 primarily affects Microsoft Windows Server 2012. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-1638?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-1638 published?: CVE-2015-1638 was published on 2015-04-14 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:datacenter:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:essentials:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:standard:*:*:*

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