CVE-2021-31955

Medium (5.5) in Microsoft Windows. In CISA KEV since 2021-11-03. EPSS 81% chance of exploitation in the next 30 days.

EPSS

81% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)

CISA KEV

listed 2021-11-03, due 2021-11-17

CWE

CWE-497

Published

2021-06-08

Modified

2026-06-17

Record from

the NVD, synced 2026-10-19

Affected

• microsoft:windows_10_1809
• microsoft:windows_10_1909
• microsoft:windows_10_2004
• microsoft:windows_10_20h2
• microsoft:windows_10_21h1
• microsoft:windows_server_2004
• microsoft:windows_server_2019
• microsoft:windows_server_20h2

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31955
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31955
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31955

Check your stackJSON