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

zetlyn/cve-nvd vulnerability cve CVE-2025-3110 cpe cpe:2.3:a:openvpn:openvpn_access_server:*:*:*:*:*:*:*:* known 2026-07-08

https://nvd.nist.gov/vuln/detail/CVE-2025-3110

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2026-10-02 12:00 UTC
Last answered
2026-10-04 12:15 UTC
Original
open at the source
What the source handed over
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2026-10-02 12:00 UTC
Last answered
2026-10-04 12:15 UTC
Original
open at the source
What the source handed over
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Last answered
2026-10-04 12:15 UTC
Original
open at the source
What the source handed over
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Its words
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Read by
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Said since
2026-10-02 12:00 UTC
Last answered
2026-10-04 12:15 UTC
Original
open at the source
What the source handed over
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            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "yes"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-07-08T16:29:40.241425Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-07-08T17:17:19.650",
    "references": [
      {
        "source": "security@openvpn.net",
        "tags": [
          "Release Notes"
        ],
        "url": "https://openvpn.net/as-docs/as-3-2-release-notes.html"
      }
    ],
    "sourceIdentifier": "security@openvpn.net",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-444"
          }
        ],
        "source": "security@openvpn.net",
        "type": "Secondary"
      }
    ]
  }
}

Text

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 OpenVPN Access Server 2.7.2 hasta 3.1.0 acepta secuencias de salto de línea desnudas dentro de los valores de encabezado HTTP, lo que permite a atacantes remotos realizar contrabando de solicitudes HTTP cuando se implementa detrás de un proxy inverso.