Vulnerability in Microsoft Windows 10 1607
CVE-2026-21249
External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing locally.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.111 (95.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.107 · newest: 0.111 · change: +0.004
Affected products
- Microsoft Windows 10 1607
- Microsoft Windows 10 1809
- Microsoft Windows 10 21h2
- Microsoft Windows 10 22h2
- Microsoft Windows 10 Version 1607 — versions 10.0.14393.0
- Microsoft Windows 10 Version 1809 — versions 10.0.17763.0
- Microsoft Windows 10 Version 21h2 — versions 10.0.19044.0
- Microsoft Windows 10 Version 22h2 — versions 10.0.19045.0
- Microsoft Windows 11 23h2
- Microsoft Windows 11 24h2
Weakness classification (CWE)
References
- Windows NTLM Spoofing Vulnerability (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-21249?
- CVE-2026-21249 is a low-severity vulnerability in Microsoft Windows 10 1607, classified under External Control of File Name or Path. CVSS score: 3.3/10. Published 2026-02-10.
- How severe is CVE-2026-21249?
- Low severity. CVSS v3 base score is 3.3 out of 10.