Is It On KEV?

Citrix NetScaler ADC and Gateway

YES - ON THE CISA KEV LIST
CVE-2025-6543

Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability

CISA catalog due date2025-07-21
overdue since 2025-07-21
EPSS exploit probability (next 30 days)10.4% · 96percentile
From CVE publication to KEV listing5 days (2025-06-25 → 2025-06-30)
Remediation window (KEV listing to due date)21 days
Days on the KEV list499 days
Date added to KEV2025-06-30
Known ransomware campaign useUnknown
VendorCitrix
ProductNetScaler ADC and Gateway
Weaknesses (CWE)CWE-119

Citrix: 27 entries (1.5% of all KEV entries are from this vendor); 6 added in 2026.

BOD 26-04 note: this is the date printed in the CISA catalog. A federal agency's actual deadline is set by its SSVC tier - Act (3 days), Attend (14 days), Track (60 days), or the next scheduled upgrade - counted from the KEV listing date or the date the vulnerability is identified in its environment, whichever comes first. Use the tier helper on each CVE page for your own window.

Your BOD 26-04 window (SSVC tier helper)

Your remediation window ends:

Description

Citrix NetScaler ADC and Gateway contain a buffer overflow vulnerability leading to unintended control flow and Denial of Service. NetScaler must be configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.

Required action (CISA)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notes

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788 ; https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/ ; https://nvd.nist.gov/vuln/detail/CVE-2025-6543

References

Other KEV entries for this vendor: Citrix

Citrix - Vendors with KEV entries

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