CISA KEV · Known exploitedCritical

CVE-2025-6543

Citrix NetScaler ADC and Gateway

Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

CVSS: 9.2
EPSS: 10.1%
CISA KEV: Listed
Published: 2025.06.25

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability10.1%

Technical severityCVSS 9.2

Vulnerability overview

Affected product and versions

Product: Citrix NetScaler ADC and Gateway
Affected versions: 14.1, 13.1, 13.1 FIPS and NDcPP, >= 13.1 < 13.1-37.236, >= 13.1 < 13.1-59.19, >= 14.1 < 14.1-47.46
Fixed versions: 13.1-37.236, 13.1-59.19, 14.1-47.46

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA 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.

Due date: 2025.07.21

1
Identify
Confirm that Citrix NetScaler ADC and Gateway and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE: CWE-119
KEV added: 2025.06.30
Ransomware use: 미확인