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CVE-2023-6549

Published: Jan 17, 2024Updated: Feb 26, 2026 Sources: CVE List NVD BDUCWE-119
NVD MITRE
8.2CVSSHIGH
EPSS Score
57.6%
Top 1.0%
CISA KEV
Active Exploitation
Since Jan 17, 2024
Exploits
No Known Exploits
Remediation
Patch Available
Am I actually vulnerable?1 Nuclei template available — see how to check your systems. How to verify

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

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:HAvailability
High
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Weaknesses

CWE-119

Affected Products

NetScaler Application Delivery ControllerCitrix Systems Inc.
Mixed
Cloud & SaaS
NetScaler GatewayCitrix Systems Inc.
Mixed
Cloud & SaaS
NetScaler ADCCloud Software Group
Mixed
Cloud & SaaS / cloud-platform
netscaler application delivery controllercitrix
On-premNetwork Device
Networking Infrastructure / load-balancer-proxy
netscaler gatewaycitrix
On-premSecurity Product
Networking Infrastructure
citrix systems inc.commercialUSCloud & SaaSaka citrix adc, netscaler gateway, citrix gateway
cloud software groupcommercialUSCloud & SaaSaka citrix
citrixcommercialUSCloud & SaaSaka xenserver, netscaler gateway firmware, application delivery controller firmware

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Jan 17, 2024
Remediation due:Feb 7, 2024

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

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://www.cybersecurity-help.cz/vdb/SB2024011635
cybersecurity-help.cz
https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549
support.citrix.com
https://www.cisa.gov/sites/default/files/csv/known_exploited_vulnerabilities.csv
cisa.gov
and 1 more references View all →

Timeline

Added to CISA KEV
Jan 17, 2024
Published
Jan 17, 2024
Last Updated
Feb 26, 2026

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