CVE-2025-5777
Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
IN CISA KEV
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
- Vendor
- Citrix
- Product
- NetScaler ADC and Gateway
- CVSS 3.1
- 7.5 (high), scored by NVD (primary)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CVSS 4.0
- 9.3 (critical), scored by secure@citrix.comCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Published
- 2025-06-17
- NVD modified
- 2026-10-08
- NVD status
- Analyzed
CISA KEV
- Date added
- 2025-07-10
- Due date
- 2025-07-11
- Ransomware use
- Known
- 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.
EPSS
100% chance of exploitation in the next 30 days (percentile 99th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
References
- support.citrix.com (Vendor Advisory)
- citrixbleed.com (Broken Link, Third Party Advisory)
- horizon3.ai (Third Party Advisory)
- labs.watchtowr.com (Third Party Advisory)
- www.bleepingcomputer.com (Press/Media Coverage, Third Party Advisory)
- www.netscaler.com (Third Party Advisory)
- www.theregister.com (Press/Media Coverage)
- doublepulsar.com (Third Party Advisory)
- reliaquest.com (Third Party Advisory)
- www.cisa.gov (US Government Resource)
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.