Linuxsecurity OpenVPN Vulnerabilities Lead to Denial of Service Risks
Article Content
- •OpenVPN has critical vulnerabilities (CVE-2026-84471 and CVE-2026-84732) affecting multiple versions.
- •The vulnerabilities could lead to denial of service or arbitrary code execution.
- •Users must update and restart OpenVPN to mitigate these risks.
On September 30, 2026, two vulnerabilities in OpenVPN were disclosed. The first, an use-after-free vulnerability in TLS session handling (CVE-2026-84471), could allow attackers to crash OpenVPN or execute arbitrary code. The second vulnerability (CVE-2026-84732) involves improper handling of ACK packet ID retransmissions, potentially leading to a timeout integer overflow and denial of service. These vulnerabilities affect multiple versions of OpenVPN across Ubuntu 26.04 LTS and earlier. Users are advised to update their systems to mitigate risks. A system restart is required after applying the updates. The vulnerabilities were published on September 7, 2026, with a CVSS score of 8.7, indicating a high severity level. No has been reported as of now.
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