Unauthenticated PHP code execution via predictable nonces
Published Apr 25, 2024 · Updated Apr 28, 2026
Code injection in Anti-Malware Security and Brute-Force Firewall 4.21.96 and earlier allows remote attackers to execute PHP code. The plugin exposes unauthenticated AJAX functions that leak microtime, derives global nonces from predictable inputs, and lets a guessed nonce replace malware definitions with attacker-controlled regular expressions. Exploitation requires brute-forcing a nonce, after which a crafted scan selectively deletes the plugin's PHP source and leaves an eval backdoor that runs commands as the web server.
Summary
What happened
Code injection in Anti-Malware Security and Brute-Force Firewall 4.21.96 and earlier allows remote attackers to execute PHP code. The plugin exposes unauthenticated AJAX functions that leak microtime, derives global nonces from predictable inputs, and lets a guessed nonce replace malware definitions with attacker-controlled regular expressions. Exploitation requires brute-forcing a nonce, after which a crafted scan selectively deletes the plugin's PHP source and leaves an eval backdoor that runs commands as the web server.
The record
- CVE
- CVE-2024-22144
- Published
- Apr 25, 2024
- Updated
- Apr 28, 2026
- Vendor
- Eli Scheetz
- Product
- Anti-Malware Security and Brute-Force Firewall
- Classifications
- CWE-94, T1505.003, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 25, 2024CVE publishedPublication date reported by the CVE source.
- Apr 28, 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=n/a <=4.21.96 changes=[{"at":"4.23.56","status":"unaffected"}]
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
- gotmls.py remote code execution demonstrationfunctional · validated
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Technologies
Your stack
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Your stack
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