CVE-2025-5777 CRITICAL

CVE-2025-5777: NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread

Vendor Netscaler
Product ADC
Weakness CWE-125
KEV Status Known Exploited
Ransomware Used in campaigns
Published June 17, 2025
Last update February 26, 2026
View on NVD All CVEs

CVSS base score

9.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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 the vulnerability does

01Description

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

CISA mandated remediation

02CISA 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.

Key dates

03Disclosure timeline

June 17, 2025 CVE published
February 26, 2026 Record updated