The Final Hang-Up: Microsoft Disables Legacy Modem Drivers for Security
ID: b538055c-f2b2-545d-89e2-7c0e57969cd1
STIX ID: report--b538055c-f2b2-545d-89e2-7c0e57969cd1
Feed Name: securityonline.info
Microsoft has deliberately decommissioned several legacy modem drivers (AGRSM64.SYS / AGRSM.SYS and SMSERL64.SYS / SMSERIAL.SYS) in a recent Windows 11 cumulative update after identification of serious security flaws (notably CVE-2023-31096 and CVE-2025-24052). The removal mitigates privilege escalation and buffer-overflow risks but breaks internet access for affected legacy hardware, primarily impacting specialized and industrial environments, and currently there is no official remediation other than uninstalling the update or foregoing future updates.
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