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MSRC compact vulnerability detail

CVE-2026-20821 · Remote Procedure Call Information Disclosure Vulnerability

Exposure of sensitive information to an unauthorized actor in Windows Remote Procedure Call allows an unauthorized attacker to disclose information locally.

Severity
Important
Impact
Information Disclosure
CVSS
6.2 base · 5.4 temporal
Release
2026-01-13
Signals
Windows Remote Procedure Call Information Disclosure Exploited: No Publicly disclosed: No Exploitability: Exploitation Unlikely
CWE
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Patch Diff
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Resolved binary override
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Description
Exposure of sensitive information to an unauthorized actor in Windows Remote Procedure Call allows an unauthorized attacker to disclose information locally.
FAQ / Articles
FAQ-Information Disclosure - Kernel Memory
What type of information could be disclosed by this vulnerability? The type of information that could be disclosed if an attacker successfully exploited this vulnerability is one byte of kernel memory could be leaked back to the attacker.
Windows Remote Procedure Call Information Disclosure Vulnerability
Exposure of sensitive information to an unauthorized actor in Windows Remote Procedure Call allows an unauthorized attacker to disclose information locally.