CVE-2025-65499

Published November 24th, 2025

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CVSS v3

4.3

MEDIUM

CVSS v2

N/A

Affected

PROJECT

Description

Array index error in tls_verify_call_back() 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_ex_data_X509_STORE_CTX_idx() to return -1.

obgm/libcoap

A CoAP (RFC 7252) implementation in C

GitHub

906