Is It On KEV?

Citrix NetScaler ADC and NetScaler Gateway

YES - ON THE CISA KEV LIST
CVE-2023-4966

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

CISA catalog due date2023-11-08
overdue since 2023-11-08
EPSS exploit probability (next 30 days)100.0% · 100percentile
From CVE publication to KEV listing8 days (2023-10-10 → 2023-10-18)
Remediation window (KEV listing to due date)21 days
Days on the KEV list1120 days
Date added to KEV2023-10-18
Known ransomware campaign useKnown
VendorCitrix
ProductNetScaler ADC and NetScaler 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 NetScaler Gateway contain a buffer overflow vulnerability that allows for sensitive information disclosure when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.

Required action (CISA)

Apply mitigations and kill all active and persistent sessions per vendor instructions [https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/] OR discontinue use of the product if mitigations are unavailable.

Notes

https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/, https://support.citrix.com/article/CTX579459/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20234966-and-cve20234967 ; https://nvd.nist.gov/vuln/detail/CVE-2023-4966

References

Other KEV entries for this vendor: Citrix

Citrix - Vendors with KEV entries

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