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CVE-2026-20940

HIGHCVSS 7.8/10EPSS 0.45%

Last modified

CVE-2026-20940 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Heap-based buffer overflow in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

Description

Heap-based buffer overflow in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.45%

36.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
MicrosoftWindows 10 1607< 10.0.14393.8783—
MicrosoftWindows 10 1809< 10.0.17763.8276—
MicrosoftWindows 10 21h2< 10.0.19044.6809—
MicrosoftWindows 10 22h2< 10.0.19045.6809—
MicrosoftWindows 11 23h2< 10.0.22631.6491—
MicrosoftWindows Server 2008All versionsSp2
MicrosoftWindows Server 2008r2Sp1
MicrosoftWindows Server 2012All versions—
MicrosoftWindows Server 2012r2—
MicrosoftWindows Server 2016< 10.0.14393.8783—
MicrosoftWindows Server 2019< 10.0.17763.8276—
MicrosoftWindows Server 2022< 10.0.20348.4648—

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-20940?
Heap-based buffer overflow in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
How severe is CVE-2026-20940?
CVE-2026-20940 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20940?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20940?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST