Urgent alerts are being issued across the security community regarding the emergence of new exploits targeting a critical vulnerability affecting certain versions of Citrix NetScaler/Citrix ADC and Gateway appliances. This vulnerability, sometimes referred to as CitrixBleed, allows attackers to potentially hijack existing authenticated sessions.
While the initial vulnerability has been known and patches were released, these newly observed exploits indicate that threat actors are developing more sophisticated or accessible methods to leverage it. This development significantly increases the risk for organizations that have not applied the necessary security updates or may still be vulnerable despite initial mitigation attempts.
The security landscape is dynamic, and the appearance of these new exploit techniques highlights the urgency for organizations to act decisively. Attackers are actively scanning the internet for vulnerable systems and are quickly incorporating these new exploits into their playbooks. Successful exploitation can lead to unauthorized access to internal networks and sensitive data, potentially bypassing multi-factor authentication in some configurations.
Experts are strongly advising organizations using affected Citrix products to immediately verify that all relevant security patches have been successfully applied. Furthermore, simply patching might not be enough if a system was compromised before the patch. Organizations should assume potential compromise and take additional steps, including terminating all active and persistent sessions on affected devices and conducting thorough investigations for signs of intrusion. Implementing robust mitigation strategies beyond just patching is now more critical than ever. The window of opportunity for attackers is widening with these new exploits, making proactive and comprehensive security measures absolutely essential.
Source: https://go.theregister.com/feed/www.theregister.com/2025/07/07/citrixbleed_2_exploits/
