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CVE-2023-6549

8.2
HIGHCVSS v3.1 Base Score
80.24%
HIGH RiskEPSS (99th percentile)
KEV

Improper Restriction of Operations within the Bounds of a Memory Buffer in NetScaler ADC and NetScaler Gateway allows Unauthenticated Denial of Service and Out-Of-Bounds Memory Read

Published: 1/17/2024
Modified: 2/26/2026
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

Vendor / Product:

Citrix NetScaler ADC and NetScaler Gateway

Required Action:

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

Due Date: 2/7/2024(OVERDUE)
Added to KEV:

1/17/2024

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

Vulnerability Summary

CVSS v3 Score

8.2HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

EPSS Score (Exploitation Probability)

80.24%HIGH Exploitation Risk
99th percentile

This vulnerability has a 80.24% probability of being exploited in the next 30 days, ranking higher than 99% of all scored CVEs.

CWE Classification

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