PT-2025-47913 · Libcoap+1 · Libcoap+1

Published 2025-11-24 · Updated 2025-12-01 · CVE-2025-65499

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 An array index 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 sending a specially crafted DTLS handshake that triggers SSL get ex data X509 STORE CTX idx() to return -1.

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

DoS

Improper Validation of Array Index

Weakness Enumeration

CWE-129

Related Identifiers

CVE-2025-65499

OPENSUSE-SU-2025:15780-1

Affected Products

Debian

Libcoap

References · 24

• https://github.com/obgm/libcoap/pull/1750 · Patch
• https://ubuntu.com/security/CVE-2025-65499 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-65499 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2025:15780-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-65499 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-65499 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-65499 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-65499 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2025-65499 · Vendor Advisory
• https://github.com/obgm/libcoap/issues/1747 · Note
• https://suse.com/security/cve/CVE-2025-65495 · Note
• https://suse.com/security/cve/CVE-2025-65498 · Note
• https://suse.com/security/cve/CVE-2025-65497 · Note
• https://suse.com/security/cve/CVE-2025-65496 · Note
• https://twitter.com/dailycve/status/1995558779958821170 · Twitter Post