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Windows 10 Agere modem drivers actively exploited elevation-of-privileges privilege-escalation flaw

Vulnerability
First reported
Last updated
Happening score
H score 26
1 unique sources, 1 articles

Summary

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An actively exploited elevation-of-privileges flaw in built-in Agere modem drivers exposed Windows 10 systems to privilege escalation risk until KB5073724 was installed. Microsoft said the issue was one of the three zero-days fixed in the January 2026 update cycle, confirming active abuse before patching. The fix removes the vulnerable modem drivers, so devices that depend on that hardware may lose modem functionality after remediation.

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Timeline

  1. 13.01.2026 20:56 2 articles · 5mo ago

    KB5073724 patch release for Windows 10

    Mitigation Patch Update

    Microsoft released KB5073724 for Windows 10 and Windows 10 Enterprise LTSC 2021 as part of January 2026 Patch Tuesday, fixing 114 vulnerabilities including 3 zero-day flaws, an actively exploited elevation-of-privileges issue in built-in Agere modem drivers, a WinSqlite3.dll flaw, and updates for expiring Secure Boot certificates; after installation, Windows 10 moves to build 19045.6809 and Windows 10 Enterprise LTSC 2021 moves to build 19044.6809, and affected systems also begin a phased rollout of new Secure Boot certificates.

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