VulnerabilityAnalyzed

CVE-2025-7775

Citrix NetScaler Memory Overflow Vulnerability

KEVCRITICAL 9.2EPSS 19.6%

Does this matter?

Known to be exploited in the wild (CISA KEV, CISA remediation deadline 28 August 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.

Description

Memory overflow vulnerability leading to Remote Code Execution and/or Denial of Service in NetScaler ADC and NetScaler Gateway when NetScaler is configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with IPv6 services or servicegroups bound with IPv6 servers (OR) NetScaler ADC and NetScaler Gateway 13.1, 14.1, 13.1-FIPS and NDcPP: LB virtual servers of type (HTTP, SSL or HTTP_QUIC) bound with DBS IPv6 services or servicegroups bound with IPv6 DBS servers (OR) CR virtual server with type HDX

CVSS 4.0: 9.2 CRITICALCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 19.63% probability · 97th percentile
CISA KEV: Listed 26 August 2025 · due 28 August 2025
Weakness: CWE-119
Affected: citrix/netscaler application delivery controller · citrix/netscaler gateway
Source: secure@citrix.com

CISA notes

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694938 ; https://nvd.nist.gov/vuln/detail/CVE-2025-7775

References

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694938Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-7775US Government Resource

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.