CVE-2025-34468: libcoap Stack-Based Buffer Overflow in Address Resolution DoS or Potential RCE

Overview

Severity

Critical (CVSS 9.8)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2025-Dec

Released

2026-01-03

Last Updated

2026-02-21

EPSS Score

0.32% (percentile: 55.5%)

Affected Products (2)

Other

• 20773-17084
• 20924-17084

Revision History

• 2026-01-03: Information published.
• 2026-01-08: Information published.
• 2026-02-21: Information published.