Security Advisory
CVE-2025-65497
4.3
MEDIUM
Vulnerability Description
NULL pointer dereference in coap_dtls_generate_cookie() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS handshake that triggers SSL_get_SSL_CTX() to return NULL.
Published Date
November 24, 2025
Official Source
NIST NVD Advisory