Resource exhaustion in OpenVPN Server - CVE-2026-84732

Vulnerability identifier: #VU147005

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-84732

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in the reliability layer when handling TLS timeouts and acknowledgements. A remote attacker can send acknowledgements for packets that cannot be outstanding to cause a denial of service.

OpenVPN Server
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
openEuler
openvpn-debugsource
openvpn-debuginfo
openvpn-auth-pam-plugin
openvpn-auth-pam-plugin-debuginfo
openvpn
openvpn-help
openvpn-devel

Install security update from vendor's website.

OpenVPN Server - update to 2.7.7
openvpn-debugsource - update to 2.3.8-16.38.1
openvpn-debuginfo - update to 2.3.8-16.38.1
openvpn-auth-pam-plugin - update to 2.3.8-16.38.1
openvpn-auth-pam-plugin-debuginfo - update to 2.3.8-16.38.1
openvpn - update to 2.3.8-16.38.1
openvpn-help - update to 2.6.9-10
openvpn-devel - update to 2.6.9-10
openvpn-debugsource - update to 2.6.9-10
openvpn-debuginfo - update to 2.6.9-10
openvpn - update to 2.6.9-10

• https://github.com/OpenVPN/openvpn/releases/tag/v2.7.7

• Multiple vulnerabilities in OpenVPN Server
• SUSE update for openvpn
• openEuler 24.03 LTS SP4 update for openvpn
• openEuler 24.03 LTS SP3 update for openvpn
• openEuler 24.03 LTS SP1 update for openvpn