CVE-2025-65494

HIGH

libcoap 4.3.5 - Denial of Service via Crafted X.509 Certificate

Title source: llm

Description

NULL pointer dereference in get_san_or_cn_from_cert() in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted X.509 certificate that causes sk_GENERAL_NAME_value() to return NULL.

References (2)

Core 2

Core References

Issue Tracking

https://github.com/obgm/libcoap/issues/1745

Issue Tracking, Patch

https://github.com/obgm/libcoap/pull/1750

Scores

CVSS v3 7.5

EPSS 0.0021

EPSS Percentile 11.3%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-476

Status published

Products (1)

libcoap/libcoap 4.3.5

Published Nov 24, 2025

Tracked Since Feb 18, 2026