High severity · published Jul 8, 2026
CVE-2025-3110
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…
7.5
CVSS
0.4%
EPSS
No
On KEV
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
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Access Server · OpenVPN
2.7.2 through 3.1.0 · source: vendor
OA
Openvpn Access Server · Openvpn
2.7.2 through 3.1.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-3110
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-3110
Release Notes
https://openvpn.net/as-docs/as-3-2-release-notes.html
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