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MSRC compact vulnerability detail

CVE-2025-29833 · Microsoft Virtual Machine Bus (VMBus) Remote Code Execution Vulnerability

Time-of-check time-of-use (toctou) race condition in Windows Virtual Machine Bus allows an unauthorized attacker to execute code locally.

Severity
Critical
Impact
Remote Code Execution
CVSS
7.7 base · 6.7 temporal
Release
2025-05-13
Signals
Windows Virtual Machine Bus Remote Code Execution Exploited: No Publicly disclosed: No Exploitability: Exploitation Less Likely
CWE
CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
Patch Diff
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Resolved binary override
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Description
Time-of-check time-of-use (toctou) race condition in Windows Virtual Machine Bus allows an unauthorized attacker to execute code locally.
FAQ / Articles
FAQ
According to the CVSS metric, user interaction is required (UI:R) and privileges required is Low (PR:L). What does that mean for this vulnerability? An authorized attacker with privileges could send controlled inputs to exploit this vulnerability.
Windows Virtual Machine Bus Remote Code Execution Vulnerability
Time-of-check time-of-use (toctou) race condition in Windows Virtual Machine Bus allows an unauthorized attacker to execute code locally.
FAQ
According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability? Successful exploitation of this vulnerability could allow a Hyper-V guest to affect the functionality of the Hyper-V host.
Windows VMSwitch Remote Code Execution Vulnerability
Time-of-check time-of-use (toctou) race condition in Windows VMSwitch allows an authorized attacker to execute code locally.
FAQ
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to win a race condition.