CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

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

criticalknown exploitedpublic exploitCVE-2025-5777
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Citrixproduct: NetScaler ADC and GatewayInformation disclosure
What
Citrix NetScaler ADC and Gateway contain an out-of-bounds read vulnerability due to insufficient input validation.
Who is affected
Users of Citrix NetScaler ADC and Gateway configured as a Gateway or AAA virtual server are affected.
Urgency
This vulnerability is critical and has been exploited, necessitating prompt remediation.
Action
Implement the recommended patches from Citrix to address this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch NetScaler ADC and Gateway

Get an email when a new NetScaler ADC and Gateway advisory drops — max one per day, one-click unsubscribe.

Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-07-10
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-5777

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-5777coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

More from CISA Known Exploited Vulnerabilities