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GobyVuls/PHP/PHP 8.1.0-dev Zerodium Backdoor
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README.md

PHP 8.1.0-dev Zerodium Backdoor vulnerabilities

PHP 8.1.0-dev is a development version of PHP. The PHP 8.1.0-dev version was implanted with a backdoor on March 28, 2021, but the backdoor was quickly discovered and removed. When the backdoor exists on the server, the attacker can execute arbitrary code by sending the User-Agentt header.

FOFA query rule: header="PHP/8.1.0"

Demo