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CVE-2026-21249

External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing locally.

Scores

3.3
CVSS 3.3 out of 10, low severity.
11.4%
EPSS 11.4% chance of exploitation in the next 30 days.

The facts

Published
10 February 2026
Last changed
17 June 2026
NVD status
Analyzed
Severity
Low, CVSS 3.3 out of 10 (version 3.1)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness
Affects
  • microsoft windows 10 1607
  • microsoft windows 10 1809
  • microsoft windows 10 21h2
  • microsoft windows 10 22h2
  • microsoft windows 11 23h2
Known exploited
Not in the CISA Known Exploited Vulnerabilities catalogue in this build.
EPSS
11.4% chance of exploitation activity in the next 30 days (percentile 96).

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References