CVE-2025-65497

4.3 MEDIUM
Published: November 24, 2025 Modified: December 01, 2025

Description

NULL pointer dereference in coap_dtls_generate_cookie() 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_SSL_CTX() to return NULL.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/obgm/libcoap/issues/1745
Source: cve@mitre.org
Issue Tracking
https://github.com/obgm/libcoap/pull/1750
Source: cve@mitre.org
Issue Tracking Patch

2 reference(s) from NVD

Quick Stats

CVSS v3 Score
4.3 / 10.0
EPSS (Exploit Probability)
0.1%
33th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

libcoap