#VU106925 Reachable assertion in OpenVPN Server - CVE-2025-2704
Published: April 3, 2025
Vulnerability identifier: #VU106925
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-2704
CWE-ID: CWE-617
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
OpenVPN Server
OpenVPN Server
Software vendor:
OpenVPN
OpenVPN
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion in server mode using TLS-crypt-v2. A remote attacker can perform a denial of service attack against the VPN server by replaying network packets in the early handshake phase.
Successful exploitation of the vulnerability requires a valid tls-crypt-v2 client key or network observation of a handshake with a valid tls-crypt-v2 client key.
Remediation
Install updates from vendor's website.