CVE-2025-6543

Known Exploited
Memory overflow vulnerability leading to unintended control flow and Denial of Service

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

Category

9.2
CVSS
Severity: Critical
CVSS 4.0 •
CVSS 3.1 •
EPSS 0.06%
KEV Since 
Vendor Advisory citrix.com
Affected: NetScaler ADC
Affected: NetScaler Gateway
Published at:
Updated at:

References

Link Tags
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-6543?
CVE-2025-6543 has been scored as a critical severity vulnerability.
How to fix CVE-2025-6543?
To fix CVE-2025-6543, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-6543 being actively exploited in the wild?
It is confirmed that CVE-2025-6543 is actively exploited. Be extra cautious if you are using vulnerable components. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-6543?
CVE-2025-6543 affects NetScaler ADC, NetScaler Gateway.
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