CitrixBleed To Infinity And Beyond (Citrix NetScaler Pre-Auth Memory Overread CVE-2026-8451)

Sicherheitsmeldung mit Schweregrad hoch (CVSS 8.8). Sie wird laut CISA-KEV aktiv ausgenutzt und sollte priorisiert behandelt werden. Betroffene Kennungen: CVE-2025-12101, CVE-2025-5777, CVE-2026-3055, CVE-2026-8451. Technische Details im Tab „Originaltext“; empfohlene Schritte in der Checkliste.

Originaltext der Quelle (nicht übersetzt) – die deutsche Zusammenfassung findest du im Tab „Kurzfassung".

Well, well, well - once again, the cat has dragged us in and spat us out.Today, we find ourselves questioning the reality we sit within. Must it be so predictable, and why us? “But watchTowr, what do you mean?”Well, if you’re here, you likely fit into one of the following categories:A dear reader,A group therapy accompliceA Groundhog Day fan club memberWhy? Because we once again find ourselves talking about Citrix NetScalers. Yes, that’s right, we’ve found another excuse to create memes and mock promise rings.For those that don’t start violently wretching when the phrase “Citrix NetScaler” is uttered, we have another word to whisper: “CitrixBleed”.As many know, the term CitrixBleed now refers to not a single vulnerability, but an entire class of Memory Disclosure-esque vulnerabilities in Citrix NetScaler devices, many of which have played roles in breaches and incidents in recent memory.For those new to this trauma, the following prior reading may be of interest:How Much More Must We Bleed? - Citrix NetScaler Memory Disclosure (CitrixBleed 2 CVE-2025-5777)Is It CitrixBleed4? Well, No. Is It Good? Also, No. (Citrix NetScaler Memory Leak & RXSS CVE-2025-12101)The Sequels Are Never As Good, But We're Still In Pain (Citrix NetScaler CVE-2026-3055 Memory Overread)Please, We Beg, Just One Weekend Free Of Appliances (Citrix NetScaler CVE-2026-3055 Memory Overread Part 2)"We told you so”, we want to scream.Huh? Why? Because, we have constantly reiterated our concern that the Memory Disclosure-esque class of vulnerability appears to be endemic within Citrix NetScaler devices - to …

Vollständiger Originalartikel ↗

• Betroffenheit im eigenen Stack prüfen (CVE-2025-12101, CVE-2025-5777, CVE-2026-3055, CVE-2026-8451): Versionen/Komponenten abgleichen.
• Originalquelle / Hersteller-Advisory lesen: https://labs.watchtowr.com/citrixbleed-to-infinity-and-beyond-citrix-netscaler-pre-auth-memory-overread-cve-2026-8451/
• Priorität HOCH: laut CISA-KEV aktiv ausgenutzt – bevorzugt patchen.
• Verfügbaren Patch oder Workaround einspielen und dokumentieren.
• Erkennung: Logs und Indikatoren (IoCs) auf Ausnutzung prüfen.