CVE-2021-34484

High (7.8) in Microsoft Windows. In CISA KEV since 2022-03-31. EPSS 22% chance of exploitation in the next 30 days.

EPSS

22% chance of exploitation in the next 30 days; higher than 97% of CVEs (scores of 2026-10-31)

CISA KEV

listed 2022-03-31, due 2022-04-21

Published

2021-08-12

Modified

2026-08-10

Record from

the NVD, synced 2026-10-19

Affected

• microsoft:windows_10_1507
• microsoft:windows_10_1607
• microsoft:windows_10_1809
• microsoft:windows_10_1909
• microsoft:windows_10_2004
• microsoft:windows_10_20h2
• microsoft:windows_10_21h1
• microsoft:windows_7
• microsoft:windows_8.1
• microsoft:windows_rt_8.1
• microsoft:windows_server_2004
• microsoft:windows_server_2008
• microsoft:windows_server_2012
• microsoft:windows_server_2016
• microsoft:windows_server_2019
• microsoft:windows_server_20h2

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34484
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34484
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34484

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