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CVE-2023-44487

High CVSS 7.5 Known exploited

Published 2023-10-10 · last changed 2026-08-11 · added to CISA KEV 2023-10-10

This one is being exploited in the wild.

CISA added CVE-2023-44487 to the Known Exploited Vulnerabilities catalog on 2023-10-10. 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-2023-44487, 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

The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.

Sources

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