CVE-2025-5777Used in ransomware
Citrix NetScaler ADC and Gateway
Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
What it is
Citrix NetScaler ADC and Gateway contain an out-of-bounds read vulnerability due to insufficient input validation. This vulnerability can lead to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor notices and references
- support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420
- nvd.nist.gov/vuln/detail/CVE-2025-5777
Description and required action as published by CISA. Full record at NVD.
Other Citrix entries on the list
- NetScaler Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability CVE-2026-88779 · Oct 4, 2026
- NetScaler Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability CVE-2026-88772 · Sep 27, 2026
- NetScaler Citrix NetScaler Improper Input Validation Vulnerability CVE-2026-88771 · Sep 27, 2026
- NetScaler Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability CVE-2026-19490 · Sep 9, 2026
- NetScaler ADC and NetScaler Gateway Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability CVE-2026-8452 · Aug 26, 2026
- NetScaler Citrix NetScaler Out-of-Bounds Read Vulnerability CVE-2026-3055 · Mar 30, 2026