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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.02037.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
OpenVPN OpenVPN 2 (Community) unaffected
Version Status Constraints
2.6.0 affected
≤ 2.6.6
OpenVPN Access Server unaffected
Version Status Constraints
2.11.0 affected
≤ 2.11.3
2.12.0 affected
≤ 2.12.2

Configuration 1 [-]

OR cpe:2.3:a:openvpn:openvpn:*:*:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn_access_server:*:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn_access_server:*:*:*:*:*:*:*:*

Configuration 2 [-]

OR cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*

No data.

No data.

Subscriptions

Vendors Products
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Fedoraproject Subscribe
Fedora Subscribe
Openvpn Subscribe
Openvpn Subscribe
Openvpn Access Server Subscribe

Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-5555-1 openvpn security update
EUVD EUVD EUVD-2023-51016 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.
Ubuntu USN Ubuntu USN USN-6484-1 OpenVPN vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://community.openvpn.net/openvpn/wiki/CVE-2023-46850 cve-icon cve-icon
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L3FS46ANNTAVLIQY56ZKGM5CBTRVBUNE/ cve-icon cve-icon
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O54I7D753V6PU6XBU26FEROD2DSHEJQ4/ cve-icon cve-icon
https://openvpn.net/security-advisory/access-server-security-update-cve-2023-46849-cve-2023-46850/ cve-icon cve-icon
https://www.debian.org/security/2023/dsa-5555 cve-icon cve-icon
History

Wed, 17 Dec 2025 05:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'None', 'Technical Impact': 'Total'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 08 Jan 2025 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'None', 'Technical Impact': 'Total'}, 'version': '2.0.3'}
cve-icon MITRE

Status: PUBLISHED

Assigner: OpenVPN

Published:

Updated: 2025-12-16T18:23:24.266Z

Reserved: 2023-10-27T13:38:49.496Z

Link: CVE-2023-46850

cve-icon Vulnrichment

Updated: 2024-08-02T20:53:21.910Z

cve-icon NVD

Status : Modified

Published: 2023-11-11T01:15:07.357

Modified: 2024-11-21T08:29:25.480

Link: CVE-2023-46850

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses