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Advisory severityMedium5.3Red Hat Linux

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.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2025-3110 Source published Source updated

VulniPulse record published Record updated

CVE-2025-3110
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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.

Is CVE-2025-3110 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2025-3110 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2025-3110?

The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.

Confirm against the vendor advisory before you patch.

Affected versions
  • 2.7.2
  • 3.1.0

Official advisory · high-confidence parse· fetched 11 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 11 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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 11 days ago·verify at source

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