Vulnerability-Lookup

CVE-2023-46850 (GCVE-0-2023-46850)

Vulnerability from cvelistv5 – Published: 2023-11-11 00:15 – Updated: 2026-06-23 21:24

Summary

Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execution when sending network buffers to a remote peer.

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-08-15 14:59 UTC

CWE

CWE-416 - Use After Free

Assigner

OpenVPN mitre root

References

5 references

URL	Tags
https://community.openvpn.net/openvpn/wiki/CVE-20…
https://openvpn.net/security-advisory/access-serv…
https://www.debian.org/security/2023/dsa-5555	x_transferred
https://lists.fedoraproject.org/archives/list/pac…	x_transferred
https://lists.fedoraproject.org/archives/list/pac…	x_transferred

Impacted products

2 products

Vendor	Product	Version	CPE status
OpenVPN	OpenVPN 2 (Community)	Affected: 2.6.0 , ≤ 2.6.6 (minor release)	guessed
OpenVPN	Access Server	Affected: 2.11.0 , ≤ 2.11.3 (patch release) Affected: 2.12.0 , ≤ 2.12.2 (patch release)	guessed

Show details on NVD website

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                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-08-15T14:59:47.646924Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-01-08T21:43:47.674Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "OpenVPN 2 (Community)",
              "vendor": "OpenVPN",
              "versions": [
                {
                  "lessThanOrEqual": "2.6.6",
                  "status": "affected",
                  "version": "2.6.0",
                  "versionType": "minor release"
                }
              ]
            },
            {
              "defaultStatus": "unaffected",
              "platforms": [
                "Linux"
              ],
              "product": "Access Server",
              "vendor": "OpenVPN",
              "versions": [
                {
                  "lessThanOrEqual": "2.11.3",
                  "status": "affected",
                  "version": "2.11.0",
                  "versionType": "patch release"
                },
                {
                  "lessThanOrEqual": "2.12.2",
                  "status": "affected",
                  "version": "2.12.0",
                  "versionType": "patch release"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execution when sending network buffers to a remote peer."
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-416",
                  "description": "CWE-416 Use After Free",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-23T21:24:00.414Z",
            "orgId": "36a55730-e66d-4d39-8ca6-3c3b3017965e",
            "shortName": "OpenVPN"
          },
          "references": [
            {
              "url": "https://community.openvpn.net/openvpn/wiki/CVE-2023-46850"
            },
            {
              "url": "https://openvpn.net/security-advisory/access-server-security-update-cve-2023-46849-cve-2023-46850/"
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "36a55730-e66d-4d39-8ca6-3c3b3017965e",
        "assignerShortName": "OpenVPN",
        "cveId": "CVE-2023-46850",
        "datePublished": "2023-11-11T00:15:07.076Z",
        "dateReserved": "2023-10-27T13:38:49.496Z",
        "dateUpdated": "2026-06-23T21:24:00.414Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

UBUNTU-CVE-2023-46850 (CVE-2023-46850)

Vulnerability from osv_ubuntu – Published: 2023-11-15 00:00 – Updated: 2025-07-16 05:09 – Source website

Withdrawn 2025-07-18

Details

Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execution when sending network buffers to a remote peer.

Severity

9.8 (Critical)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2023-46850	REPORT
	https://community.openvpn.net/openvpn/wiki/CVE-20…	REPORT
	https://openvpn.net/security-advisory/access-serv…	REPORT
	https://ubuntu.com/security/notices/USN-6484-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2023-46850	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openvpn",
            "binary_version": "2.4.7-1ubuntu2.20.04.4"
          },
          {
            "binary_name": "openvpn-dbgsym",
            "binary_version": "2.4.7-1ubuntu2.20.04.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "openvpn",
        "purl": "pkg:deb/ubuntu/openvpn@2.4.7-1ubuntu2.20.04.4?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.7-1ubuntu2.20.04.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.4.7-1ubuntu2",
        "2.4.7-1ubuntu2.20.04.2",
        "2.4.7-1ubuntu2.20.04.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openvpn",
            "binary_version": "2.5.5-1ubuntu3.1"
          },
          {
            "binary_name": "openvpn-dbgsym",
            "binary_version": "2.5.5-1ubuntu3.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "openvpn",
        "purl": "pkg:deb/ubuntu/openvpn@2.5.5-1ubuntu3.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.5.5-1ubuntu3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.5.1-3ubuntu1",
        "2.5.1-3ubuntu2",
        "2.5.1-3ubuntu4",
        "2.5.1-3ubuntu5",
        "2.5.5-1ubuntu1",
        "2.5.5-1ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execution when sending network buffers to a remote peer.",
  "id": "UBUNTU-CVE-2023-46850",
  "modified": "2025-07-16T05:09:41Z",
  "published": "2023-11-15T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-46850"
    },
    {
      "type": "REPORT",
      "url": "https://community.openvpn.net/openvpn/wiki/CVE-2023-46850"
    },
    {
      "type": "REPORT",
      "url": "https://openvpn.net/security-advisory/access-server-security-update-cve-2023-46849-cve-2023-46850/"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6484-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-46850"
    }
  ],
  "related": [
    "USN-6484-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2023-46850"
  ],
  "withdrawn": "2025-07-18T16:54:40Z"
}

USN-6484-1

Vulnerability from osv_ubuntu – Published: 2023-11-16 13:09 – Updated: 2023-11-16 13:09 – Source website

Summary

openvpn vulnerabilities

Details

It was discovered that OpenVPN incorrectly handled the --fragment option in certain configurations. A remote attacker could possibly use this issue to cause OpenVPN to crash, resulting in a denial of service. (CVE-2023-46849)

It was discovered that OpenVPN incorrectly handled certain memory operations. A remote attacker could use this issue to cause OpenVPN to crash, obtain sensitive information, or possibly execute arbitrary code. (CVE-2023-46850)

References

URL

Type

	https://ubuntu.com/security/notices/USN-6484-1	ADVISORY
	https://ubuntu.com/security/CVE-2023-46849	REPORT
	https://ubuntu.com/security/CVE-2023-46850	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "openvpn",
            "binary_version": "2.6.5-0ubuntu1.1"
          },
          {
            "binary_name": "openvpn-dbgsym",
            "binary_version": "2.6.5-0ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:23.10",
        "name": "openvpn",
        "purl": "pkg:deb/ubuntu/openvpn@2.6.5-0ubuntu1.1?arch=source\u0026distro=mantic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.5-0ubuntu1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6.1-1ubuntu1",
        "2.6.3-1ubuntu1",
        "2.6.3-2ubuntu1",
        "2.6.5-0ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that OpenVPN incorrectly handled the --fragment option\nin certain configurations. A remote attacker could possibly use this issue\nto cause OpenVPN to crash, resulting in a denial of service.\n(CVE-2023-46849)\n\nIt was discovered that OpenVPN incorrectly handled certain memory\noperations. A remote attacker could use this issue to cause OpenVPN to\ncrash, obtain sensitive information, or possibly execute arbitrary code.\n(CVE-2023-46850)\n",
  "id": "USN-6484-1",
  "modified": "2023-11-16T13:09:52.156615Z",
  "published": "2023-11-16T13:09:52.156615Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6484-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-46849"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-46850"
    }
  ],
  "related": [
    "CVE-2023-46849",
    "UBUNTU-CVE-2023-46849",
    "CVE-2023-46850",
    "UBUNTU-CVE-2023-46850"
  ],
  "schema_version": "1.6.3",
  "summary": "openvpn vulnerabilities"
}

WID-SEC-W-2023-2872

Vulnerability from csaf_certbund - Published: 2023-11-09 23:00 - Updated: 2024-09-22 22:00

Summary

OpenVPN: Mehrere Schwachstellen

Severity

Mittel

Scope

2 vulnerabilities in this advisory, including CVE-2023-46850.

CVE-2023-46850

Es besteht eine Schwachstelle in OpenVPN. Dieser Fehler besteht in den TLS-Verbindungen, da ein Sendepuffer falsch verwendet wird, was dazu führt, dass freier()Speicher an die Gegenstelle gesendet wird. Ein entfernter, authentifizierter Angreifer kann diese Schwachstelle ausnutzen, um vertrauliche Informationen offenzulegen.

Known affected: 5 products

Open the full advisory

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2023-46850 (GCVE-0-2023-46850)

UBUNTU-CVE-2023-46850 (CVE-2023-46850)

USN-6484-1

WID-SEC-W-2023-2872

Tags

Sightings

Nomenclature

Related by attack behaviour