CVE-2025-65499
MEDIUMLibcoap - Improper Array Index Validation
Title source: ruleDescription
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.
Scores
CVSS v3
4.3
EPSS
0.0014
EPSS Percentile
33.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Classification
CWE
CWE-129
Status
published
Affected Products (1)
libcoap/libcoap
Timeline
Published
Nov 24, 2025
Tracked Since
Feb 18, 2026