Microsoft Streaming Service Proxy Elevation of Privilege Vulnerability

Summary

Microsoft Windows systems that include the Streaming Service Proxy component are affected by this vulnerability. An attacker who already has access to a system could exploit it to gain elevated privileges, such as SYSTEM-level control.

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

Timeline

1. Sep 12, 2023Added to CISA KEV

   CISA has evidence of exploitation in the wild

2. Sep 12, 2023, 4:58 PM UTCCVE published
3. Oct 3, 2023CISA remediation deadline

   Due date for US federal agencies to patch

4. Oct 30, 2025, 6:17 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 10 Version 1809

  From 10.0.17763.0 · fixed in 10.0.17763.4851

• Microsoft Windows 10 Version 1809

  From 10.0.0 · fixed in 10.0.17763.4851

• Microsoft Windows Server 2019

  From 10.0.17763.0 · fixed in 10.0.17763.4851

• Microsoft Windows Server 2019 (Server Core installation)

  From 10.0.17763.0 · fixed in 10.0.17763.4851

• Microsoft Windows Server 2022

  From 10.0.20348.0 · fixed in 10.0.20348.1970

• Microsoft Windows 11 version 21H2

  From 10.0.0 · fixed in 10.0.22000.2416

• Microsoft Windows 10 Version 21H2

  From 10.0.19043.0 · fixed in 10.0.19044.3448

• Microsoft Windows 11 version 22H2

  From 10.0.22621.0 · fixed in 10.0.22621.2283

• Microsoft Windows 10 Version 22H2

  From 10.0.19045.0 · fixed in 10.0.19045.3448

References 1