PT-2025-47909 · Libcoap+2 · Libcoap+2

Published 2025-11-24 · Updated 2026-02-24 · CVE-2025-65495

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions OISM libcoap version 4.3.5

Description An integer signedness error exists in the tls verify call back() function located in src/coap openssl.c. This flaw allows remote attackers to potentially cause a denial of service by providing a specially crafted TLS certificate. The issue arises because the i2d X509() function can return -1, and this value is then incorrectly used as a parameter for malloc(), leading to a crash.

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

DoS

Weakness Enumeration

CWE-195

Related Identifiers

CVE-2025-65495

OPENSUSE-SU-2025:15780-1

Affected Products

Debian

Red Os

Libcoap

References · 25

• https://github.com/obgm/libcoap/pull/1750 · Patch
• https://osv.dev/vulnerability/CVE-2025-65495 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-65495 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-65495 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2025:15780-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-65495 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-65495 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-65495 · Security Note
• https://ubuntu.com/security/CVE-2025-65495 · Vendor Advisory
• https://github.com/obgm/libcoap/issues/1744 · Note
• https://suse.com/security/cve/CVE-2025-65501 · Note
• https://suse.com/security/cve/CVE-2025-65499 · Note
• https://twitter.com/CVEnew/status/1992962963578212413 · Twitter Post
• https://t.me/cveNotify/143791 · Telegram Post
• https://suse.com/security/cve/CVE-2025-65496 · Note