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CVE-2025-6543

Published: Jun 25, 2025Updated: Oct 24, 2025 Sources: CVE List NVD BDUCWE-119
9.8CRITICAL
NVD MITRE
EPSS Score
9.8%
Top 5.1%
CISA KEV
Active Exploitation
Since Jun 30, 2025
Exploits
No Known Exploits
Remediation
Patch Available

Description

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

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-119

Affected Products

NetScaler Application Delivery ControllerCitrix Systems Inc.
On-premNetwork Device
Networking Infrastructure / load-balancer-proxy
NetScaler GatewayCitrix Systems Inc.
On-premNetwork Device
Networking Infrastructure
netscaler application delivery controllercitrix
On-premNetwork Device
Networking Infrastructure / load-balancer-proxy
netscaler gatewaycitrix
On-premSecurity Product
Networking Infrastructure
ADCNetScaler
On-prem
Networking Infrastructure / load-balancer-proxy
citrix systems inc.commercialUSCloud & SaaSaka citrix adc, netscaler gateway, citrix gateway
citrixcommercialUSCloud & SaaSaka xenserver, netscaler gateway firmware, application delivery controller firmware
netscalercommercialNetworking Infrastructure
and 1 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Jun 30, 2025
Remediation due:Jul 21, 2025

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.

Official Patch Available
No detection template yetWe can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://nvd.nist.gov/vuln/detail/CVE-2025-6543
nvd.nist.gov
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788
support.citrix.com
https://www.esentire.com/security-advisories/actively-exploited-citrix-vulnerability-cve-2025-6543
esentire.com
and 4 more references View all →

Timeline

Published
Jun 25, 2025
Added to CISA KEV
Jun 30, 2025
Last Updated
Oct 24, 2025

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