July 10, 2025 · Applied Cybernetics Group
CVE-2025-5777 — Citrix NetScaler ADC and Gateway
known ransomware use
Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
- Added to KEV
2025-07-10- Federal due date
2025-07-11- Vendor
- Citrix
- Product
- NetScaler ADC and Gateway
- EPSS
- 100.0th percentile (score 0.999, as of
2026-07-13) - NVD CVSS v3.1
- 7.5 (HIGH)
- Ransomware use
- Known
- ATT&CK
- T1190 , T1555 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2025-5777
CISA short description
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.
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
NVD description
Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server