CVE-2025-5777—Citrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability

Vulnerability Name

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

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.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

KNOWN

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.

Additional Notes

• https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420
• https://nvd.nist.gov/vuln/detail/CVE-2025-5777

Related News Articles

• Ransomware Groups Turn to Citrix Bleed 2, BYOVD, and Supply Chain CredentialsJuly 2, 2026
• INC Ransomware Emerges as Major RaaS Threat in 2026 with 830+ Victims Since 2023June 18, 2026
• Citrix NetScaler Under Active Recon for CVE-2026-3055 (CVSS 9.3) Memory Overread BugMarch 28, 2026
• Citrix Urges Patching Critical NetScaler Flaw Allowing Unauthenticated Data LeaksMarch 24, 2026
• Wave of Citrix NetScaler scans use thousands of residential proxiesFebruary 3, 2026

Related Weaknesses

• CWE-125