CVE tracker / CVE-2025-29833

CVE-2025-29833

CVE-2025-29833 is the Microsoft Virtual Machine Bus (VMBus) Remote Code Execution Vulnerability. Microsoft rates it Critical, CVSS 7.7. It is not in CISA's Known Exploited Vulnerabilities catalog. Published May 13, 2025.

Risk summary

HighRemote Code Execution
7.7
CVSS v3 base
0.5%
EPSS: chance of exploitation in 30 days
High
Severity
Critical
Microsoft's rating
Less Likely
Microsoft: exploitation
No
In CISA KEV

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

How to fix it

Microsoft lists 31 affected products and the update that fixes each:

What Microsoft changed

Details

Weakness
CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
Publicly disclosed (Microsoft)
No
Exploited (Microsoft)
No
Known exploited (CISA KEV)
Not listed
Published
May 13, 2025
Last revised
May 14, 2025

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References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.