A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows

Summary

This vulnerability affects Microsoft Windows Domain Name System (DNS) servers. An attacker who sends specially crafted requests to an affected server could run arbitrary code remotely on it.

Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.

Timeline

1. Jul 14, 2020, 10:54 PM UTCCVE published
2. Nov 3, 2021Added to CISA KEV

   CISA has evidence of exploitation in the wild

3. May 3, 2022CISA remediation deadline

   Due date for US federal agencies to patch

4. Oct 21, 2025, 11:35 PM UTCRecord last updated
5. Oct 22, 2026EPSS reached 10%

   FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

• Microsoft Windows Server

  2019, 2019 (Core installation), 2016, 2016 (Core installation), 2008 for 32-bit Systems Service Pack 2, 2008 for 32-bit Systems Service Pack 2 (Core installation), 2008 for x64-based Systems Service Pack 2, 2008 for x64-based Systems Service Pack 2 (Core installation), 2008 R2 for x64-based Systems Service Pack 1, 2008 R2 for x64-based Systems Service Pack 1 (Core installation), 2012, 2012 (Core installation), 2012 R2, 2012 R2 (Core installation)

• Microsoft Windows Server, version 1909 (Server Core installation)

  Version range not reported

• Microsoft Windows Server, version 1903 (Server Core installation)

  Version range not reported

• Microsoft Windows Server, version 2004 (Server Core installation)

  Version range not reported

References 2