CVE-2026-54887: DTLS server cookie bypass during startup window due to empty initial cookie secret

Overview

Severity

Medium (CVSS 4.8)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Jul

Released

2026-08-14

EPSS Score

0.24% (percentile: 15.6%)

Affected Products (1)

Other

• 21649-17084

Revision History

• 2026-08-14: Information published.