CVE tracker / CVE-2025-29955

CVE-2025-29955

CVE-2025-29955 is the Windows Hyper-V Denial of Service Vulnerability. Microsoft rates it Important, CVSS 6.2. It is not in CISA's Known Exploited Vulnerabilities catalog. Published May 13, 2025.

Risk summary

MediumDenial of Service
6.2
CVSS v3 base
0.6%
EPSS: chance of exploitation in 30 days
Medium
Severity
Important
Microsoft's rating
Unlikely
Microsoft: exploitation
No
In CISA KEV

Microsoft describes it: “Improper input validation in Windows Hyper-V allows an unauthorized attacker to deny service locally.”

How to fix it

Microsoft lists 4 affected products and the update that fixes each:

What Microsoft changed

Details

Weakness
CWE-20: Improper Input Validation
Publicly disclosed (Microsoft)
No
Exploited (Microsoft)
No
Known exploited (CISA KEV)
Not listed
Published
May 13, 2025
Last revised
May 13, 2025

Get told when this changes

Senserva Watch emails Microsoft security and patch alerts when something moves: a new exploitation report, a revised fix, a known issue. Free, one email address.

Join Senserva Watch

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.