NetScaler ADC and Gateway
CVE-2023-6549: NetScaler ADC and NetScaler Gateway Buffer Overflow
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
ExploitedYes, in CISA KEVAdded 17 Jan 2024
Ransomware useNot reportedPer CISA
SeverityHIGHCVSS 3.1 8.2
EPSS58%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| NetScaler ADC 14.1 | 12.35 or later |
| NetScaler ADC 13.1 | 51.15 or later |
| NetScaler ADC 13.0 | 92.21 or later |
| NetScaler ADC 13.1-FIPS | 37.176 or later |
| NetScaler ADC 12.1-FIPS | 55.302 or later |
| NetScaler ADC 12.1-NDcPP | 55.302 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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
Exploitation
CISA lists this CVE as exploited in the wild since 17 Jan 2024.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.