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CVE-2021-25487

High CVSS 7.3 Known exploited

Published 2021-10-06 · last changed 2026-06-17 · added to CISA KEV 2023-06-29

This one is being exploited in the wild.

CISA added CVE-2021-25487 to the Known Exploited Vulnerabilities catalog on 2023-06-29. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2021-25487, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

Lack of boundary checking of a buffer in set_skb_priv() of modem interface driver prior to SMR Oct-2021 Release 1 allows OOB read and it results in arbitrary code execution by dereference of invalid function pointer.

Sources

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N