CVE-2023-46850

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-11-11 · updated 2026-06-23
Weakness: CWE-416

Description

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.

Affected products

Debian Linux: 12.0
Fedoraproject Fedora: 39
OpenVPN: from 2.6.0 through 2.6.6
OpenVPN Access Server: from 2.11.0 through 2.11.3; from 2.12.0 before 2.12.2 — fixed in 2.12.2

How to fix

Upgrade to a fixed version: OpenVPN Access Server 2.12.2. Check the vendor advisory for mitigations.

References

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

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