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CVE-2025-21242: Microsoft Windows Kerberos Information Disclosure

CVE-2025-21242 · published 1 year ago

Summary

A security issue in Microsoft Windows Kerberos protocol can allow an attacker to obtain sensitive information. This could potentially be used to impersonate users or steal sensitive data. Update your Windows systems to patch this vulnerability to prevent exploitation.

What to do

Update microsoft windows_10_1507 to version 10.0.10240.20890 or later.
Update microsoft windows_10_1607 to version 10.0.14393.7699 or later.
Update microsoft windows_10_1809 to version 10.0.17763.6775 or later.
Update microsoft windows_10_21h2 to version 10.0.19044.5371 or later.
Update microsoft windows_10_22h2 to version 10.0.19045.5371 or later.
Update microsoft windows_11_22h2 to version 10.0.22621.4751 or later.
Update microsoft windows_11_23h2 to version 10.0.22631.4751 or later.
Update microsoft windows_11_24h2 to version 10.0.26100.2894 or later.
Update microsoft windows_server_2016 to version 10.0.14393.7699 or later.
Update microsoft windows_server_2019 to version 10.0.17763.6775 or later.
Update microsoft windows_server_2022 to version 10.0.20348.3091 or later.
Update microsoft windows_server_2022_23h2 to version 10.0.25398.1369 or later.
Update microsoft windows_server_2025 to version 10.0.26100.2894 or later.

Affected software

Vendor	Product	Affected versions
microsoft	windows_10_1507	< 10.0.10240.20890 `cpe:2.3:o:microsoft:windows_10_1507:::::::x64:*`
microsoft	windows_10_1607	< 10.0.14393.7699 `cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*`
microsoft	windows_10_1809	< 10.0.17763.6775 `cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*`
microsoft	windows_10_21h2	< 10.0.19044.5371 `cpe:2.3:o:microsoft:windows_10_21h2::::::::`
microsoft	windows_10_22h2	< 10.0.19045.5371 `cpe:2.3:o:microsoft:windows_10_22h2::::::::`
microsoft	windows_11_22h2	< 10.0.22621.4751 `cpe:2.3:o:microsoft:windows_11_22h2::::::::`
microsoft	windows_11_23h2	< 10.0.22631.4751 `cpe:2.3:o:microsoft:windows_11_23h2::::::::`
microsoft	windows_11_24h2	< 10.0.26100.2894 `cpe:2.3:o:microsoft:windows_11_24h2::::::::`
microsoft	windows_server_2008	r2 `cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64:*`
microsoft	windows_server_2012	r2 `cpe:2.3:o:microsoft:windows_server_2012:-:::::::*`
microsoft	windows_server_2016	< 10.0.14393.7699 `cpe:2.3:o:microsoft:windows_server_2016::::::::`
microsoft	windows_server_2019	< 10.0.17763.6775 `cpe:2.3:o:microsoft:windows_server_2019::::::::`
microsoft	windows_server_2022	< 10.0.20348.3091 `cpe:2.3:o:microsoft:windows_server_2022::::::::`
microsoft	windows_server_2022_23h2	< 10.0.25398.1369 `cpe:2.3:o:microsoft:windows_server_2022_23h2::::::::`
microsoft	windows_server_2025	< 10.0.26100.2894 `cpe:2.3:o:microsoft:windows_server_2025:::::::x64:*`

Original advisory text

Windows Kerberos Information Disclosure Vulnerability

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21242 Patch Vendor Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker partial control

Severity

5.9 Medium

Exploitation

2% chance of attack within 30 days

Type

CWE-200Information Exposure

Timeline

Published14 Jan 2025

Updated3 Nov 2026

First seen7 Mar 2026

Sources

CVE-2025-21242 · NVD

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