PT-2025-47910 · Libcoap+2 · Libcoap+2

Published 2025-11-24 · Updated 2026-02-24 · CVE-2025-65496

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions libcoap version 4.3.5

Description A flaw exists in the processing of DTLS handshakes due to a NULL pointer dereference within the coap dtls generate cookie() function, located in src/coap openssl.c. This issue arises when SSL get SSL CTX() returns NULL during a crafted DTLS handshake. Successful exploitation can lead to a denial of service.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2025-65496

OPENSUSE-SU-2025:15780-1

Affected Products

Debian

Red Os

Libcoap

References · 25

• https://github.com/obgm/libcoap/pull/1750 · Patch
• https://security-tracker.debian.org/tracker/CVE-2025-65496 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-65496 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-65496 · Security Note
• https://ubuntu.com/security/CVE-2025-65496 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-65496 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-65496 · Security Note
• https://osv.dev/vulnerability/CVE-2025-65496 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:15780-1 · Vendor Advisory
• https://github.com/obgm/libcoap/issues/1745 · Note
• https://suse.com/security/cve/CVE-2025-65501 · Note
• https://twitter.com/VulmonFeeds/status/1992984612360904759 · Twitter Post
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti-red-os-8-0/uyazvimost-libcoap-cve-2025-65496-8.0 · Note
• https://suse.com/security/cve/CVE-2025-65496 · Note
• https://t.me/CVEtracker/38074 · Telegram Post