CVE Watch—

CVE-2023-6549

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

CVSS

—

No CVSS

EPSS

57.6%

p99

KEV

YES

Jan 17, 2024

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

57.6%EPSS · 30 days57.6%

2026-06-302026-07-16

KEV catalog record

Product

Citrix / NetScaler ADC and NetScaler Gateway

Vulnerability

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

Added to KEV

Jan 17, 2024

Remediate by

Feb 7, 2024

Known ransomware use

Summary description

Citrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for a denial-of-service when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.

Required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Notes

https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549; https://nvd.nist.gov/vuln/detail/CVE-2023-6549

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