CVE-2025-5777

HIGH7.5

CISA KEV

Published 2025-06-17 · Updated 2026-10-08 · Source secure@citrix.com

Summary

CVE-2025-5777 is a high-severity (CVSS 7.5) vulnerability in Citrix NetScaler ADC and Gateway. CISA added it to the Known Exploited Vulnerabilities catalog on July 10, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by July 11, 2025. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Citrix has 27 vulnerabilities in the KEV catalog, 7 of them linked to ransomware.

All 27 known-exploited Citrix vulnerabilities →

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

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CWE-125CWE-908

CISA Known-Exploited Vulnerability

Product: Citrix — NetScaler ADC and Gateway

Name: Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability

Date added: 2025-07-10 · Due: 2025-07-11

USED IN RANSOMWARE

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.

References

View on NVD

More exploited Citrix vulnerabilities

Most recently added to CISA KEV

CVE-2026-88779
NetScaler — Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
added 2026-10-04
CVE-2026-88772
NetScaler — Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
added 2026-09-27
CVE-2026-88771
NetScaler — Citrix NetScaler Improper Input Validation Vulnerability
added 2026-09-27
CVE-2026-19490
NetScaler — Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability
added 2026-09-09
CVE-2026-8452
NetScaler ADC and NetScaler Gateway — Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
added 2026-08-26
CVE-2026-3055
NetScaler — Citrix NetScaler Out-of-Bounds Read Vulnerability
added 2026-03-30

View all →

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