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CVE-2025-26634

HIGHCVSS 7.5/10EPSS 0.60%

Last modified

CVE-2025-26634 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Heap-based buffer overflow in Windows Core Messaging allows an authorized attacker to elevate privileges over a network.. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

Description

Heap-based buffer overflow in Windows Core Messaging allows an authorized attacker to elevate privileges over a network.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
0.60%

44.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
MicrosoftWindows 10 1507< 10.0.10240.20915
MicrosoftWindows 10 1607< 10.0.14393.7785
MicrosoftWindows 10 21h2< 10.0.19044.5487
MicrosoftWindows 10 22h2< 10.0.19045.5487
MicrosoftWindows 11 22h2< 10.0.22621.4890
MicrosoftWindows 11 23h2< 10.0.22631.4890
MicrosoftWindows 11 24h2< 10.0.26100.3194
MicrosoftWindows Server 2016< 10.0.14393.7785
MicrosoftWindows Server 2019< 10.0.17763.6893
MicrosoftWindows Server 2022< 10.0.20348.3207
MicrosoftWindows Server 2022 23h2< 10.0.25398.1425
MicrosoftWindows Server 2025< 10.0.26100.3194

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2025-26634?
Heap-based buffer overflow in Windows Core Messaging allows an authorized attacker to elevate privileges over a network.
How severe is CVE-2025-26634?
CVE-2025-26634 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.
How do I fix CVE-2025-26634?
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-2025-26634?

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

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Source: NVD / NIST