PT-2025-47577 · Openvpn+4 · Openvpn+4

Published 2025-11-17 · Updated 2026-04-15 · CVE-2025-13086

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 OpenVPN versions prior to 2.6.16

Description The memcmp() function in OpenVPN has an issue related to the use of a cryptographic algorithm with flaws when processing HMAC requests. Successful exploitation could allow a remote attacker to gain unauthorized access to protected information.

Recommendations Update to version 2.6.16 or later.

Fix

DoS

Use of a Broken Cryptographic Algorithm

Session Fixation

Inadequate Encryption Strength

Weakness Enumeration

CWE-327

CWE-384

CWE-326

CWE-940

Related Identifiers

BDU:2025-14653

CLEANSTART-2026-MW52599

CVE-2025-13086

DSA-6069-1

OESA-2025-2742

OPENSUSE-SU-2026:20137-1

SUSE-SU-2026:0831-1

SUSE-SU-2026:20196-1

USN-7898-1

Affected Products

Debian

Linuxmint

Openvpn

Red Os

Ubuntu

References · 44

• https://nvd.nist.gov/vuln/detail/CVE-2025-2704 · Security Note
• https://osv.dev/vulnerability/CVE-2025-13086 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0831-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-14653 · Security Note
• https://wiki.astralinux.ru/astra-linux-se38-bulletin-2026-0305SE38 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:20137-1 · Vendor Advisory
• https://community.openvpn.net/Security%20Announcements/CVE-2025-13086 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se18-bulletin-2026-0224SE18 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-13086 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-13086 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-13086 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2025-13086 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-13086 · Vendor Advisory
• https://osv.dev/vulnerability/USN-7898-1 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2025-2742 · Vendor Advisory