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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

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 0.00478.

Exploitation none

Automatable yes

Technical Impact partial

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
≤ 2.12.1

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:2.12.0:*:*:*:*:*:*:*
cpe:2.3:a:openvpn:openvpn_access_server:2.12.1:*:*:*:*:*:*:*

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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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-2023-51015 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.
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-2023-46849 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, 11 Jun 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Status: PUBLISHED

Assigner: OpenVPN

Published:

Updated: 2025-06-11T14:30:02.796Z

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

Link: CVE-2023-46849

cve-icon Vulnrichment

Updated: 2024-08-02T20:53:21.915Z

cve-icon NVD

Status : Modified

Published: 2023-11-11T01:15:07.270

Modified: 2025-06-11T15:15:26.793

Link: CVE-2023-46849

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses