OpenVPN: Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-3959 · first 15.10.2026 · updated 15.10.2026 · CVSS 7,6
What it is about
OpenVPN ist eine Open Source Software zum Aufbau eines Virtuellen Privaten Netzwerkes (VPN) über eine verschlüsselte TLS-Verbindung. Zur Verschlüsselung werden die Bibliotheken des Programmes OpenSSL benutzt. Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in OpenVPN ausnutzen, um Informationen offenzulegen oder einen Denial of Service Angriff durchzuführen.
Under what conditions?
Over the network, but only with valid access (login required), for example with stolen credentials or as an insider.
What can happen in the worst case
An attacker could use the vulnerability to
- Informationen offenzulegen oder einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Open Source OpenVPN <2.7.7
- Open Source OpenVPN <2.6.23
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Open Source OpenVPN 2.7.7
- Open Source OpenVPN 2.6.23
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- OpenVPN Security Announcements vom 2026-10-14 community.openvpn.net
- EU Vulnerability Database vom 2026-10-14 euvd.enisa.europa.eu
CVE: CVE-2026-84471
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.