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Vulnerability record · CVE-2023-46849 · published 11 November 2023

CVE-2023-46849: Openvpn divide by zero vulnerability

Openvpn · Openvpn

Using the --fragment option in certain configuration setups OpenVPN version 2.6.0 to 2.6.6 allows an attacker to trigger a divide by zero behaviour which could cause an application crash, leading to a denial of service.

7.5 CVSS 3.1 High EPSS 1.2% · top 34.4% CWE-369 · Divide by zero
7.5CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

Using the --fragment option in certain configuration setups OpenVPN version 2.6.0 to 2.6.6 allows an attacker to trigger a divide by zero behaviour which could cause an application crash, leading to a denial of service.

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://community.openvpn.net/openvpn/wiki/CVE-2023-46849 Vendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/L3FS46ANNTAVLIQY56ZKGM5CB Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/O54I7D753V6PU6XBU26FEROD2
https://openvpn.net/security-advisory/access-server-security-update-cve-2023-46849-cve-2023-46850/ Vendor Advisory
https://www.debian.org/security/2023/dsa-5555 Third Party Advisory
https://community.openvpn.net/openvpn/wiki/CVE-2023-46849 Vendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/L3FS46ANNTAVLIQY56ZKGM5CB Mailing List
https://lists.fedoraproject.org/archives/list/[email protected]/message/O54I7D753V6PU6XBU26FEROD2
https://openvpn.net/security-advisory/access-server-security-update-cve-2023-46849-cve-2023-46850/ Vendor Advisory
https://www.debian.org/security/2023/dsa-5555 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-46849), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.