PT-2026-7351 · Microsoft · Windows Hyper-V+1

B2Ahex + 1 · Published 2026-02-10 · Updated 2026-02-10 · CVE-2026-21247

Positive Technologies (AI Summary)

CVSS v3.1

7.3

High

Base vector

AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows Hyper-V (affected versions not specified)

Description A flaw in input validation within Windows Hyper-V can allow a local attacker to execute code. The issue enables remote attackers to execute arbitrary code and compromise the system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Out of bounds Read

Heap Based Buffer Overflow

Weakness Enumeration

CWE-125

CWE-20

CWE-122

Related Identifiers

BDU:2026-01752

CVE-2026-21247

Affected Products

Windows

Windows Hyper-V

References · 6

• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-21247 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21247 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21247 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-21247 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21247 · Security Note
• https://bdu.fstec.ru/vul/2026-01752 · Security Note