IP protection bypass via spoofed forwarding header
Published Aug 31, 2024 · Updated Apr 8, 2026
IP protection bypass in WP Cerber Security 9.4 and earlier allows remote attackers to evade blocked-IP controls via crafted HTTP requests. When reverse-proxy IP detection is enabled, the client-IP resolver accepts an attacker-supplied X-Forwarded-For address instead of the blocked network source. A blocked remote attacker can therefore reach WordPress functions that the IP access list was configured to deny; the default configuration does not process that header.
Summary
What happened
IP protection bypass in WP Cerber Security 9.4 and earlier allows remote attackers to evade blocked-IP controls via crafted HTTP requests. When reverse-proxy IP detection is enabled, the client-IP resolver accepts an attacker-supplied X-Forwarded-For address instead of the blocked network source. A blocked remote attacker can therefore reach WordPress functions that the IP access list was configured to deny; the default configuration does not process that header.
The record
- CVE
- CVE-2022-4100
- Published
- Aug 31, 2024
- Updated
- Apr 8, 2026
- Vendor
- Cerber Tech Inc.
- Product
- WP Cerber Security, Anti-spam & Malware Scan
- Classifications
- CWE-693
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 31, 2024CVE publishedPublication date reported by the CVE source.
- Apr 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=9.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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