SB2025112771 - Ubuntu update for openvpn
Published: November 27, 2025
Security Bulletin ID
SB2025112771
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Insufficient verification of data authenticity (CVE-ID: CVE-2025-13086)
CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to improper handling of HMAC verification checks during the three way handshake. A remote attacker can bypass source IP address validation and connect to the server from an IP address that did not initiate the initial connection.
Remediation
Install update from vendor's website.