Security researchers have released proof-of-concept (PoC) exploit <\/a>code for CVE-2025-20029, a high-severity command injection vulnerability affecting F5\u2019s BIG-IP application delivery controllers.\u00a0<\/p>\n The flaw, which carries a CVSS v3.1 score of 8.8, enables authenticated attackers to execute arbitrary system commands through improper neutralization of special elements in the iControl REST API and TMOS Shell (tmsh).\u00a0<\/p>\n Successful exploitation allows attackers with standard user privileges to escalate to root-level access, compromising the entire BIG-IP control plane infrastructure.<\/p>\n The vulnerability arises from insufficient input sanitization in the tmsh command-line interface\u2019s save functionality, where attackers can inject malicious parameters containing shell metacharacters like ; or &&.\u00a0<\/p>\n This bypasses F5\u2019s restricted command environment through improper handling of user-supplied arguments passed to system() calls.\u00a0<\/p>\n While exploitation requires valid credentials, the attack complexity remains low due to the predictable structure of vulnerable command <\/a>sequences.<\/p>\n Researchers demonstrated that combining this vulnerability with stolen credentials allows attackers to execute reconnaissance commands via tmsh\u2019s show subcommands, write malicious payloads to \/var\/tmp using echo redirection, and trigger privilege escalation through cron job injection.<\/p>\n The released<\/a> PoC leverages BIG-IP\u2019s REST API endpoint \/mgmt\/tm\/util\/bash to bypass command restrictions. A crafted JSON payload exploits the improper argument handling in the configuration backup process.\u00a0<\/p>\n Successful execution returns a 200 OK response while running injected commands with root privileges.<\/p>\n Analysts confirm the exploit chain can:<\/p>\n Temporary mitigations include:<\/p>\n CVE-2025-20029 represents a critical infrastructure threat requiring prioritized remediation.\u00a0<\/p>\n Organizations should apply F5\u2019s<\/a> security updates within 24-hour emergency change windows, conduct forensic audits of systems exposed to management interface traffic and implement runtime application self-protection (RASP) rules to detect command injection patterns.<\/p>\n As network appliances increasingly become attack vectors, the security community emphasizes hardening API endpoints and adopting zero-trust principles<\/a> for management plane access.<\/p>\n Free Webinar: Better SOC with Interactive Malware Sandbox for Incident Response and Threat Hunting \u2013\u00a0Register Here<\/a><\/strong><\/p>\n The post PoC Exploit Released for F5 BIG-IP Command Injection Vulnerability<\/a> appeared first on Cyber Security News<\/a>.<\/p>\n<\/div>\nAffected Versions and Fix Released<\/strong><\/h2>\n
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Proof-of-Concept Exploit Mechanics<\/strong><\/h2>\n
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Mitigation Strategies<\/strong><\/h2>\n
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