Cyb3rius
@cyb3rius
· Aug 24
Why is Citrix Bleed so dangerous for enterprises?It lets attackers hijack live session cookies, bypassing passwords and MFA on Citrix NetScaler devices.What happened: Citrix disclosed CVE-2023-4966 on October 10, 2023, but it was already exploited in the wild since late August. LockBit used it to breach Boeing in late October, forcing the company to admit data was stolen. Mandiant says multiple groups mass-exploited the flaw, leaving thousands of servers backdoored.Key numbers: CVSS score of 9.4 out of 10 for severity43GB of Boeing data stolen before the patch was applied1,500+ Citrix servers compromised via cookie "session stealing"Why it matters: Even fully patched devices stay vulnerable if the stolen session cookie is still valid, allowing attackers to walk past MFA unimpeded.Bottom line: Session hijacking turns your strongest security control into a skeleton key—patch and rotate all sessions immediately.
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