Medium [CVE-2025-3110] HTTP request smuggling via bare line-feed sequences in HTTP headers
This medium-severity Red Hat Linux advisory covers CVE-2025-3110.
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Summary
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 The issue stems from the server accepting unstandardized bare line-feed sequences in HTTP headers.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N). Weakness: CWE-444.
- 2.7.2
- 3.1.0
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
Mitigation checklist
- To mitigate this issue, ensure that any reverse proxy deployed in front of OpenVPN Access Server is configured to strictly validate and normalize HTTP header fields, specifically rejecting or sanitizing bare line-feed sequences. Alternatively, consider restricting direct network access to the OpenVPN Access Server, bypassing the reverse proxy, if your deployment architecture allows for it without compromising other security requirements. Consult your reverse proxy's documentation for specific configuration options related to HTTP header parsing and normalization. Any changes to proxy configurations may require a service reload or restart to take effect, which could temporarily interrupt service.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
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