CVE-2025-65501: Libcoap

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Null pointer dereference in coap_dtls_info_callback() in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a DTLS handshake where SSL_get_app_data() returns NULL.

Affected products

• Libcoap Libcoap: version 4.3.5 only

Published 2025-11-24. Last modified 2026-06-17.