CVE-2026-21245

CWE-122 — Heap-based Buffer OverflowCWE-787 — Out-of-bounds Write5 documents5 sources
Severity
7.8HIGH
EPSS
0.0%
top 90.23%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
7
Microsoft Windows 11 Version 24h2Microsoft Windows 11 Version 25h2Microsoft Windows 11 Version 26h1+4 more
Timeline
PublishedFeb 10

Description

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages8 packages

▶NVDmicrosoft/windows< 10.0.26100.32313
▶NVDmicrosoft/windows_11_24h2< 10.0.26100.7781
▶NVDmicrosoft/windows_11_25h2< 10.0.26200.7781
▶CVEListV5microsoft/windows_server_202510.0.26100.0 — 10.0.26100.32370
▶CVEListV5microsoft/windows_11_version_24h210.0.26100.0 — 10.0.26100.7840

🔴Vulnerability Details

2
CVEList
Windows Kernel Elevation of Privilege Vulnerability↗2026-02-10
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GHSA
GHSA-w8gr-fpp3-xwvp: Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally↗2026-02-10
▶

📋Vendor Advisories

1
Microsoft
Windows Kernel Elevation of Privilege Vulnerability↗2026-02-10
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-21245 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2026-21245 (HIGH CVSS 7.8) | Heap-based buffer overflow in Windo | cvebase.io