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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.

CVE-2025-65499 is a vulnerability identified in libcoap version 4.3.5, an open-source implementation of the Constrained Application Protocol (CoAP) commonly used in IoT and constrained network environments. The flaw resides in the tls_verify_call_back() function within the source file src/coap_openssl.c, where an array index error occurs due to improper handling of the return value from SSL_get_ex_data_X509_STORE_CTX_idx(). Specifically, when a crafted DTLS handshake is received, this function can return -1, which is not properly checked before being used as an array index, leading to out-of-bounds access. This results in a denial of service condition by crashing or destabilizing the libcoap service handling the handshake. The vulnerability is exploitable remotely without authentication and requires the attacker to initiate a DTLS handshake, which constitutes user interaction. The CVSS v3.1 base score is 4.3 (medium), reflecting the limited impact on confidentiality and integrity but a clear impact on availability. No patches or fixes have been published at the time of disclosure, and no known exploits exist in the wild. The underlying weakness corresponds to CWE-129 (Improper Validation of Array Index). Given libcoap’s role in constrained environments and IoT devices, this vulnerability could disrupt services relying on DTLS-secured CoAP communications.

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CVE-2025-65499: n/a - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-65499: n/a

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