CVE detail
CVE-2026-21247
Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 11.0 · diversity 10.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
2 source links · newest first
- The February 2026 Security Update ReviewZero Day Initiative
ake a closer look at some of the more interesting updates for this month, starting with the bugs under active attack: - CVE-2026-21510 - Windows Shell Security Feature Bypass Vulnerability This bug is listed as a security feature bypass, but it could also be classified as code execution. An attacker can bypass Windows SmartScreen and Windows Shell secu
vendorwww.thezdi.comFeb 10, 2026, 6:30 PM - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21247msrc.microsoft.com
No excerpt available.
Vendor Advisorymsrc.microsoft.comFeb 10, 2026, 6:16 PM
Exploit code
Public exploit repository references
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0 repository references · best confidence N/A · max 0 stars
Related records
Similar CVEs
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Heap-based buffer overflow in Windows Hyper-V allows an unauthorized attacker to execute code locally.
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- CVE-2026-32149CVSS 7.3 · High
Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.
- CVE-2026-45636CVSS 7.8 · High
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- CVE-2026-32177CVSS 7.3 · High
Heap-based buffer overflow in .NET allows an unauthorized attacker to elevate privileges locally.
- CVE-2025-59275CVSS 7.8 · High
Improper validation of specified type of input in Windows Authentication Methods allows an authorized attacker to elevate privileges locally.