CVE-2025-5777
NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread
- Critical 9.3
- Exploited: added to CISA KEV 10 Jul 2025
- Used in ransomware campaigns
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
Key facts
- Published
- 17 Jun 2025
- Last changed
- 7 Oct 2026
- Assigned by
- Citrix
- KEV added
- 10 Jul 2025
- KEV fix due
- 11 Jul 2025
- Used in ransomware
- Yes, according to CISA
- EPSS
- 99.919% likely to be exploited in the next 30 days, higher than 99.969% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.3CVSS 4.0, Criticalfrom the CNA (Citrix)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
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.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| NetScaler | ADC |
|
| NetScaler | Gateway |
|
Timeline
- 17 Jun 2025 Published
- 10 Jul 2025 Added to the CISA KEV catalogue