Vulnerability-Lookup

CVE-2025-2704 (GCVE-0-2025-2704)

Vulnerability from cvelistv5 – Published: 2025-04-02 21:00 – Updated: 2025-10-23 10:53

Summary

OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-754 - Improper Check for Unusual or Exceptional Conditions

Assigner

OpenVPN

References

3 references

URL	Tags
https://community.openvpn.net/openvpn/wiki/CVE-20…	vendor-advisory
https://www.mail-archive.com/openvpn-announce@lis…	release-notes
http://www.openwall.com/lists/oss-security/2025/04/02/5

Impacted products

1 product

Vendor	Product	Version
OpenVPN	OpenVPN	Affected: 2.6.1 , ≤ 2.6.13 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-04-03T00:11:05.289Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2025/04/02/5"
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        "title": "CVE Program Container"
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        "metrics": [
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              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
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                "id": "CVE-2025-2704",
                "options": [
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                  },
                  {
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                  },
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                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-04-07T17:20:44.473236Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-07T17:23:59.009Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "OpenVPN",
          "vendor": "OpenVPN",
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              "version": "2.6.1",
              "versionType": "semver"
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        "shortName": "OpenVPN"
      },
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          "tags": [
            "vendor-advisory"
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          "url": "https://community.openvpn.net/openvpn/wiki/CVE-2025-2704"
        },
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00142.html"
        }
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    "assignerShortName": "OpenVPN",
    "cveId": "CVE-2025-2704",
    "datePublished": "2025-04-02T21:00:58.582Z",
    "dateReserved": "2025-03-24T10:26:42.493Z",
    "dateUpdated": "2025-10-23T10:53:34.373Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-08-05",
      "epss": "0.00815",
      "percentile": "0.53561"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-2704\",\"sourceIdentifier\":\"security@openvpn.net\",\"published\":\"2025-04-02T21:15:32.943\",\"lastModified\":\"2026-06-17T09:07:28.283\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase\"},{\"lang\":\"es\",\"value\":\"Las versiones 2.6.1 a 2.6.13 de OpenVPN en modo servidor que utilizan TLS-crypt-v2 permiten a atacantes remotos provocar una denegaci\u00f3n de servicio al corromper y reproducir paquetes de red en la fase inicial del protocolo de enlace.\"}],\"affected\":[{\"source\":\"security@openvpn.net\",\"affectedData\":[{\"vendor\":\"OpenVPN\",\"product\":\"OpenVPN\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"2.6.1\",\"lessThanOrEqual\":\"2.6.13\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-04-07T17:20:44.473236Z\",\"id\":\"CVE-2025-2704\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security@openvpn.net\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-754\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-754\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openvpn:openvpn:*:*:*:*:community:*:*:*\",\"versionStartIncluding\":\"2.6.1\",\"versionEndIncluding\":\"2.6.13\",\"matchCriteriaId\":\"2BC16851-89DA-4AFB-96D2-AAF258DCF5DC\"}]}]}],\"references\":[{\"url\":\"https://community.openvpn.net/openvpn/wiki/CVE-2025-2704\",\"source\":\"security@openvpn.net\",\"tags\":[\"Broken Link\"]},{\"url\":\"https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00142.html\",\"source\":\"security@openvpn.net\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2025/04/02/5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\"]}]}}",
    "redhat_vex": {
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      "cve": "CVE-2025-2704",
      "id": "CVE-2025-2704",
      "initial_release_date": "2025-04-02T21:00:58.582000+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "openvpn: OpenVPN in a server role with tls-crypt-v2 enabled can reach an assertion failed state when receiving specially crafted packets",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-2704.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T19:10:42Z",
      "cve": "CVE-2025-2704",
      "id": "CVE-2025-2704",
      "initial_release_date": "2025-04-04T03:00:29Z",
      "product_status:known_not_affected": "83",
      "product_status:recommended": "60",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-2704",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-2704.json",
      "version": "11"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2025-2704\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-04-07T17:23:59.009Z\", \"dateReserved\": \"2025-03-24T10:26:42.493Z\", \"assignerOrgId\": \"36a55730-e66d-4d39-8ca6-3c3b3017965e\", \"datePublished\": \"2025-04-02T21:00:58.582Z\", \"assignerShortName\": \"OpenVPN\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}

WID-SEC-W-2025-0694

Vulnerability from csaf_certbund - Published: 2025-04-02 22:00 - Updated: 2025-06-09 22:00

Summary

OpenVPN: Schwachstelle ermöglicht Denial of Service

Severity

Mittel

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: OpenVPN ist eine Open Source Software zum Aufbau eines Virtuellen Privaten Netzwerkes (VPN) über eine verschlüsselte TLS-Verbindung. Zur Verschlüsselung werden die Bibliotheken des Programmes OpenSSL benutzt.

Angriff: Ein entfernter, anonymer Angreifer kann eine Schwachstelle in OpenVPN ausnutzen, um einen Denial of Service Angriff durchzuführen.

Betroffene Betriebssysteme: - Linux - UNIX - Windows

CVE-2025-2704

Affected products

Known affected 3 products

Product	Identifier	Version
SUSE Linux SUSE	`cpe:/o:suse:suse_linux:-`	—
Ubuntu Linux Ubuntu	`cpe:/o:canonical:ubuntu_linux:-`	—
Open Source OpenVPN <2.6.14 Open Source / OpenVPN		<2.6.14

References

8 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/advisories/GHSA-5gwv-2q72-gxrm	external
https://community.openvpn.net/openvpn/wiki/Downlo…	external
https://seclists.org/oss-sec/2025/q2/8	external
https://ubuntu.com/security/notices/USN-7411-1	external
https://lists.suse.com/pipermail/sle-security-upd…	external
https://lists.suse.com/pipermail/sle-security-upd…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "OpenVPN ist eine Open Source Software zum Aufbau eines Virtuellen Privaten Netzwerkes (VPN) \u00fcber eine verschl\u00fcsselte TLS-Verbindung. Zur Verschl\u00fcsselung werden die Bibliotheken des Programmes OpenSSL benutzt.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in OpenVPN ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2025-0694 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2025/wid-sec-w-2025-0694.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2025-0694 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2025-0694"
      },
      {
        "category": "external",
        "summary": "GitHub Advisory Database vom 2025-04-02",
        "url": "https://github.com/advisories/GHSA-5gwv-2q72-gxrm"
      },
      {
        "category": "external",
        "summary": "OpenVPN Wiki vom 2025-04-02",
        "url": "https://community.openvpn.net/openvpn/wiki/Downloads#OpenVPN2.6.14--Released02April2025"
      },
      {
        "category": "external",
        "summary": "OSS Security Mailing List vom 2025-04-02",
        "url": "https://seclists.org/oss-sec/2025/q2/8"
      },
      {
        "category": "external",
        "summary": "Ubuntu Security Notice USN-7411-1 vom 2025-04-03",
        "url": "https://ubuntu.com/security/notices/USN-7411-1"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2025:1508-1 vom 2025-05-07",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2025-May/020807.html"
      },
      {
        "category": "external",
        "summary": "SUSE Security Update SUSE-SU-2025:01508-1 vom 2025-06-06",
        "url": "https://lists.suse.com/pipermail/sle-security-updates/2025-June/021425.html"
      }
    ],
    "source_lang": "en-US",
    "title": "OpenVPN: Schwachstelle erm\u00f6glicht Denial of Service",
    "tracking": {
      "current_release_date": "2025-06-09T22:00:00.000+00:00",
      "generator": {
        "date": "2025-06-10T08:25:30.830+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.3.12"
        }
      },
      "id": "WID-SEC-W-2025-0694",
      "initial_release_date": "2025-04-02T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2025-04-02T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2025-04-03T22:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von Ubuntu aufgenommen"
        },
        {
          "date": "2025-05-07T22:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von SUSE aufgenommen"
        },
        {
          "date": "2025-06-09T22:00:00.000+00:00",
          "number": "4",
          "summary": "Neue Updates von SUSE aufgenommen"
        }
      ],
      "status": "final",
      "version": "4"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c2.6.14",
                "product": {
                  "name": "Open Source OpenVPN \u003c2.6.14",
                  "product_id": "T042350"
                }
              },
              {
                "category": "product_version",
                "name": "2.6.14",
                "product": {
                  "name": "Open Source OpenVPN 2.6.14",
                  "product_id": "T042350-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:openvpn:openvpn:2.6.14"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "OpenVPN"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "SUSE Linux",
            "product": {
              "name": "SUSE Linux",
              "product_id": "T002207",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:suse_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Ubuntu Linux",
            "product": {
              "name": "Ubuntu Linux",
              "product_id": "T000126",
              "product_identification_helper": {
                "cpe": "cpe:/o:canonical:ubuntu_linux:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Ubuntu"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-2704",
      "product_status": {
        "known_affected": [
          "T002207",
          "T000126",
          "T042350"
        ]
      },
      "release_date": "2025-04-02T22:00:00.000+00:00",
      "title": "CVE-2025-2704"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2025-2704 (GCVE-0-2025-2704)

WID-SEC-W-2025-0694

Tags

Sightings

Nomenclature