CVE-2025-65496

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CVSS 3.1

4.3 medium

EPSS

<1%p18

Published

Nov 24, 2025 (Nov 24, 2025)

Modified

Jun 17, 2026

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.

Vendors: libcoap
Products: libcoap
Weakness: CWE-476
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

NVD CVE.org GitHub PoCs EPSS (0.3%)

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