CVE-2025-5777CitrixFirewall and VPNJuly 10, 2025

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

High 7.5Actively exploitedUsed by ransomware

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.

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.

Running Citrix devices? Get an email when a new vulnerability comes out. Free, unsubscribe in one click.
Turn on Citrix alerts

Details

Vendor
Citrix
Product
NetScaler ADC e Gateway
CVE
CVE-2025-5777
Affected versions
NetScaler ADC 12.1: 12.1 before 12.1-55.328 — fixed in 12.1-55.328
NetScaler ADC 13.1: 13.1 before 13.1-58.32 (13.1-37.x before 13.1-37.235) — fixed in 13.1-58.32
NetScaler ADC 14.1: 14.1 before 14.1-43.56 — fixed in 14.1-43.56
NetScaler Gateway 13.1: 13.1 before 13.1-58.32 — fixed in 13.1-58.32
NetScaler Gateway 14.1: 14.1 before 14.1-43.56 — fixed in 14.1-43.56 (from the advisory and NVD; check the exact builds in the official advisory)
CVSS score
7.5
Actively exploited
Yes, listed in the CISA Known Exploited Vulnerabilities catalog
CISA due date
July 11, 2025 (deadline for US federal agencies: a good benchmark for you too)
Source
CISA KEV – original advisory
Published
July 10, 2025

The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.

More Citrix advisories