CVE-2026-21248

CWE-122 — Heap-based Buffer OverflowCWE-787 — Out-of-bounds Write5 documents5 sources
Severity
7.3HIGH
EPSS
0.0%
top 92.31%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
24
Microsoft Windows 10 Version 1607Microsoft Windows 10 Version 1809Microsoft Windows 10 Version 21h2+21 more
Timeline
PublishedFeb 10

Description

Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:HExploitability: 1.3 | Impact: 5.9

Affected Packages24 packages

▶NVDmicrosoft/windows< 10.0.14393.8868+4
▶NVDmicrosoft/windows_10_1607< 10.0.14393.8868
▶NVDmicrosoft/windows_10_1809< 10.0.17763.8389
▶NVDmicrosoft/windows_10_21h2< 10.0.19044.6937
▶NVDmicrosoft/windows_10_22h2< 10.0.19045.6937

🔴Vulnerability Details

2
CVEList
Windows Hyper-V Remote Code Execution Vulnerability↗2026-02-10
▶
GHSA
GHSA-9h9g-xpmp-46vg: Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally↗2026-02-10
▶

📋Vendor Advisories

1
Microsoft
Windows Hyper-V Remote Code Execution Vulnerability↗2026-02-10
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-21248 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2026-21248 (HIGH CVSS 7.3) | Heap-based buffer overflow in Windo | cvebase.io