CVE-2023-46849 Denial of service in Access Server

What is CVE-2023-46849?

CVE-2023-46849 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 11 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-369

Which versions are affected by CVE-2023-46849?

It affects 4 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Openvpn Openvpn, Openvpn Openvpn Access Server.

How do I fix CVE-2023-46849?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-46849 being exploited?

There is no known exploitation of CVE-2023-46849 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2023-46849, DEBIAN-CVE-2023-46849, GHSA-p99v-qjfm-8vvq.