CVE-2025-65496 – OISM libcoap NULL Pointer Dereference Denial of Service

CVE ID : CVE-2025-65496

Published : Nov. 24, 2025, 2:15 p.m. | 1 hour, 7 minutes ago

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.

Severity: 0.0 | NA

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