CVE-2025-65493
HIGHlibcoap 4.3.5 - Denial of Service via Crafted DTLS/TLS Connection
Title source: llmDescription
NULL pointer dereference in src/coap_openssl.c in OISM libcoap 4.3.5 allows remote attackers to cause a denial of service via a crafted DTLS/TLS connection that triggers BIO_get_data() to return NULL.
References (2)
Core 2
Core References
Issue Tracking
https://github.com/obgm/libcoap/issues/1743
Issue Tracking, Patch
https://github.com/obgm/libcoap/pull/1750
Scores
CVSS v3
7.5
EPSS
0.0032
EPSS Percentile
23.4%
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