CVE-2022-43515: X-Forwarded-For header is active by default causes access to Zabbix sites in maintenance mode

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-12-05 · updated 2026-06-17
Weakness: CWE-20

Description

Zabbix Frontend provides a feature that allows admins to maintain the installation and ensure that only certain IP addresses can access it. In this way, any user will not be able to access the Zabbix Frontend while it is being maintained and possible sensitive data will be prevented from being disclosed. An attacker can bypass this protection and access the instance using IP address not listed in the defined range.

Affected products

Zabbix Frontend: from 4.0.0 through 4.0.44; from 5.0.0 through 5.0.29; from 6.0.0 through 6.0.9; from 6.2.0 through 6.2.4; 5.0.30-rc1, 6.0.11-rc1, 6.2.5-rc1

References

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