SECURELYN
Free ScanFree consultation

CVE-2026-20872

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

Scores

6.5
CVSS 6.5 out of 10, medium severity.
19.8%
EPSS 19.8% chance of exploitation in the next 30 days.

The facts

Published
13 January 2026
Last changed
30 July 2026
NVD status
Modified
Severity
Medium, CVSS 6.5 out of 10 (version 3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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
19.8% chance of exploitation activity in the next 30 days (percentile 97).

Is there a Securelyn advisory?

Not yet. Securelyn writes plain-English advisories for the flaws that matter most to businesses. Subscribe to the digest to hear about them.

References