CVE DATABASE / CVE-2023-6549
CVE-2023-6549
Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
CVSS 8.2 · HIGH
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2024-01-17.
Federal remediation due 2024-02-07.
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Summary
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
CVSS 3.1 breakdown
| Base score | 8.2 (HIGH) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity | LOW |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Citrix netscaler application delivery controllerCitrix netscaler gateway
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References
- https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-6549
Data: NIST NVD + CISA KEV. NVD last modified 2026-02-26. Always verify against the vendor advisory before acting.