CVE-2022-43515Public exploitNetwork attack vector

Unauthenticated maintenance-mode bypass via spoofed client IP

Published Dec 12, 2022 · Updated Nov 3, 2025

Authentication bypass in affected Zabbix Frontend releases allows remote attackers to access maintenance-mode sites via a forged header. CWebUser::getIp() prefers the untrusted HTTP_X_FORWARDED_FOR value over REMOTE_ADDR, so the maintenance allowlist evaluates an attacker-supplied address. Maintenance mode and an IP allowlist must be enabled; the bypass grants unauthenticated frontend access otherwise denied by source IP.

CVSS severity5.3
Medium
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in affected Zabbix Frontend releases allows remote attackers to access maintenance-mode sites via a forged header. CWebUser::getIp() prefers the untrusted HTTP_X_FORWARDED_FOR value over REMOTE_ADDR, so the maintenance allowlist evaluates an attacker-supplied address. Maintenance mode and an IP allowlist must be enabled; the bypass grants unauthenticated frontend access otherwise denied by source IP.

The record

CVE
CVE-2022-43515
Published
Dec 12, 2022
Updated
Nov 3, 2025
Vendor
Zabbix
Product
Zabbix Frontend
Classifications
CWE-20, CWE-863, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.0-4.0.44
  2. Affected versionversion=5.0.0-5.0.29
  3. Affected versionversion=6.0.0-6.0.9
  4. Affected versionversion=6.2.0-6.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zabbix · Zabbix Frontendversion=4.0.0-4.0.44; version=5.0.0-5.0.29; version=6.0.0-6.0.9; version=6.2.0-6.2.4

Published CVSS scores

5.3ZabbixCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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