Citrix Netscaler customers - keep calm and patch CVE-2025-5777 from Tuesday.

It allows unauth memory reads, has similarities to CitrixBleed (CVE-2023-4966) as may allow session token theft.

An update on CVE-2025-5777, explaining why orgs should identify systems and patch.

https://doublepulsar.com/citrixbleed-2-electric-boogaloo-cve-2025-5777-c7f5e349d206

CitrixBleed 2: Electric Boogaloo — CVE-2025–5777 - DoublePulsar

Remember CitrixBleed, the vulnerability where a simple HTTP request would dump memory, revealing session tokens? CVE-2023–4966 You may have missed it, as the original CVE on 17th June 2025 referred…

DoublePulsar
Worth noting that every write up says this vuln applies to the management interface - but that isn’t true, it’s because the initial CVE entry was wrong, and nobody does CVE entry updates in write ups.
Don't panic, but it's only a matter of time before critical 'CitrixBleed 2' is under attack

: Why are you even reading this story? Patch now!

The Register

@GossiTheDog I hope nobody is still misled by the pre-correction CVE into thinking that this is just a 'mitigate by controlling access to management interface like you should probably do anyway' thing that they can just defer to lower priority maintenance.

Relatively severe either way; but that teensy little correction was not loud enough for how dramatically an otherwise plausible mitigation turned out to be useless.