In the world of cybersecurity, few things are as intriguing as a vulnerability that seems to have slipped through the cracks of common knowledge. One such case is the so-called While you won't find a dedicated CVE entry with that exact name, it refers to a real and impactful vulnerability within the F5 FirePass SSL VPN platform—officially tracked as CVE-2007-0186 . The nomenclature likely originates from two key components of the vulnerable system: the /vdesk/ administrative directory and the my.logon.php3 script, which played central roles in the exploit.
The script passes user-supplied input directly into a system-level function (like ) without filtering shell metacharacters.
are actually just the APM system doing its job by redirecting unauthenticated or malformed traffic away from protected resources. Mitigation and Best Practices For administrators seeing high traffic to this URI: Validate Host Headers: host validation is properly configured to prevent unnecessary redirects. iRule Implementation:
It is worth noting that vulnerabilities within PHP itself remain a persistent concern in 2026. These include memory corruption bugs in the PHP interpreter, deserialization flaws (e.g., CVE-2026-XXXX—current year examples), and vulnerabilities in common PHP extensions. However, these are distinct from application-level flaws in vDesk or F5 APM.
Historically, some versions of the FirePass SSL VPN failed to sanitize input or validate the source of a request. Attackers could trick an authenticated user into clicking a link that executed actions in their session before "hanging up." vdesk hangupphp3 exploit
Issues were identified where users were unexpectedly redirected to hangup.php3 due to session management flaws. In some cases, this could be leveraged to force a user out of a legitimate session or redirect them to a malicious site after their session was terminated.
# View APM log activity for unexpected session drops cat /var/log/apm | grep -i "hangup" Use code with caution.
: Modern variants of redirection vulnerabilities, such as CVE-2023-22418, have affected BIG-IP APM, allowing attackers to trick users into visiting malicious sites through crafted URIs. 2. Why Am I Redirected?
A WAF can detect and block common traversal patterns (like ../ ) before they ever reach your application. Conclusion In the world of cybersecurity, few things are
Specifically used for ending sessions, this script often lacked the security tokens needed to prevent CSRF.
uri_path:"/vdesk/hangup.php3" AND status:302 AND referer:*
The absence of public proof-of-concept code does not guarantee safety. Attackers with sufficient resources can develop their own exploits, especially for vulnerabilities as severe as the 9.8-rated flaws listed above.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Bug ID 686691 - F5 Networks The script passes user-supplied input directly into a
Log bloating, performance overhead from processing invalid requests.
Other advisories indicate that the vulnerability extended through as well. The attack required no authentication, making it highly accessible to any external party able to reach the VPN login page over the internet or internal network.
The and "JavaScript contained in an <FP_DO_NOT_TOUCH> element" are particularly interesting, suggesting that even the custom sanitization logic implemented by F5 was vulnerable to advanced JavaScript injection techniques.