CVE-2023-29451 Denial of service caused by a bug in the JSON parser

Medium 4.7 Published 13 Jul 2023 Updated 13 Feb 2025

A crafted string triggers a buffer overrun in the JSON parser, crashing the Zabbix Server or Proxy.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2023-29451?

CVE-2023-29451 is a medium-severity denial of service vulnerability in Zabbix Zabbix, published on 13 Jul 2023. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Specially crafted string can cause a buffer overrun in the JSON parser library leading to a crash of the Zabbix Server or a Zabbix Proxy.

Weakness: CWE-787, CWE-20

Which versions are affected by CVE-2023-29451?

It affects 1 product.

Products include Zabbix Zabbix.

How do I fix CVE-2023-29451?

Apply the vendor's patch.

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-2023-29451 being exploited?

There is no known exploitation of CVE-2023-29451 in the wild and no public exploit code.

All Zabbix Zabbix vulnerabilities

Sources

Also known as DEBIAN-CVE-2023-29451, GHSA-5q7w-vc8g-r5vx.