What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-07-13 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Zabbix: through 6.0.14; from 6.4.2 through 6.4.4; 6.4.0-alpha1, 6.4.0-beta1, 6.4.0-beta2, 6.4.0-beta3, 6.4.0-beta4, 6.4.0-beta5 (+4)

References

• https://lists.debian.org/debian-lts-announce/2023/08/msg00027.html
• https://support.zabbix.com/browse/ZBX-22587
• https://lists.debian.org/debian-lts-announce/2023/08/msg00027.html
• https://support.zabbix.com/browse/ZBX-22587

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