CVE-2025-3110 Other in Access Server

What is CVE-2025-3110?

CVE-2025-3110 is a medium-severity vulnerability in OpenVPN Access Server, published on 8 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

OpenVPN Access Server 2.7.2 through 3.1.0 accepts bare line-feed sequences inside HTTP header values, allowing remote attackers to perform HTTP request smuggling when deployed behind a reverse proxy

Weakness: CWE-444

Which versions are affected by CVE-2025-3110?

It affects 1 product.

Products include Openvpn Openvpn Access Server.

How do I fix CVE-2025-3110?

No fix has been published for CVE-2025-3110 yet. Limit exposure of the affected software until one is available.

Is CVE-2025-3110 being exploited?

There is no known exploitation of CVE-2025-3110 in the wild and no public exploit code.

Other vulnerabilities in OpenVPN Access Server

• CVE-2020-8953 Auth bypass in n/a Critical 9.8
• CVE-2021-4234 Denial of service in OpenVPN Access Server High 7.5
• CVE-2022-33737 Information disclosure in OpenVPN Access Server High 7.5
• CVE-2022-33738 Weak cryptography in OpenVPN Access Server High 7.5
• CVE-2020-36382 Denial of service in OpenVPN Access Server High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-92x4-7936-ww96.