CVE-2025-65499 – OISM libcoap Denial of Service

CVE ID : CVE-2025-65499

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

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.

Severity: 0.0 | NA

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