# CVE-2023-6549: Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

> CVE-2023-6549: Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability. CVSS 8.2 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2023-6549
Last updated: 2025-10-21T23:05:27Z

- Published: 2024-01-17 20:15 UTC · Updated: 2025-10-21 23:05 UTC · Assigner: Citrix
- CVSS: 8.2 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- EPSS: 57.6%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2024-01-17, federal due date 2024-02-07, ransomware use: Unknown
- CWE: CWE-119

## Description

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

## CISA required action

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

## Affected vendors and products

- Cloud Software Group: NetScaler ADC

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2023-6549)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2023-6549)
- [https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549](https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2023-6549 · Markdown: https://rewindex.com/cve/CVE-2023-6549.md · JSON: https://rewindex.com/api/v1/cves/CVE-2023-6549 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:13:14.920Z