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Fencer Vulns
critical 9.8

CVE-2023-46850 json

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 ne…

published 2023-11-11 2 y ago modified 2026-06-23 4 mo ago also EUVD-2023-51016

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

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.

Patch / fix

  • openvpn openvpn_access_server 2.12.2
  • openvpn Debian 12 2.6.3-1+deb12u2
  • openvpn Debian 14, Debian 13 2.6.7-1

debian advisories DEBIAN-CVE-2023-46850

  • openvpn openSUSE Tumbleweed 2.6.7-1.1

opensuse advisories openSUSE-SU-2024:13429-1

  • openvpn Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 2.6.7-r0

alpine advisories ALPINE-CVE-2023-46850

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-46850 updated cvss 7.5

openvpn: Incorrect use of send buffer can cause memory to be sent to peer

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
14 mo ago

Exploit prediction

2.00% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • OpenVPN OpenVPN 2 (Community)
  • OpenVPN Access Server

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.