Vulnerability · Published Jul 8, 2026 · Assigned by OpenVPN
CVE-2025-3110
Medium 6.9
In plain English
A medium-severity security flaw in Access Server from OpenVPN. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).
Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.4%top 61.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenVPN | Access Server | 2.7.2 – through 3.1.0 |
Weakness: CWE-444 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
References
- https://openvpn.net/as-docs/as-3-2-release-notes.html release-notes