Citrix NetScaler: 2 flaws used in attacks; attackers can run commands on it

OFFICIAL NAMES: Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability · Citrix NetScaler Improper Input Validation Vulnerability

WHAT IT IS · VPN, FIREWALL OR GATEWAYIt sits at the edge of your network and faces the internet, so attackers can reach it directly.

DO THIS FIRSTIf you have it, patch it today. If you cannot, block access to it from the internet until you can. Not sure if you use it? Send this page to your IT provider or security lead and ask.

TECHNICAL SUMMARY Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.

WHY THIS VERDICT Attacks are confirmed. The vulnerability is 44 days old, so many systems are likely still unpatched. Ready-made attack tools are public. It affects a product that faces the internet or gives remote access. The severity score is critical (9.5). The exploit prediction score is 82%.

WHY IT RANKS HERE Exploitation is confirmed by an authoritative source. The product faces the internet or gives remote access. Ready-made attack tools are public. 3 products are affected.