Unauthenticated service disruption via out-of-bounds memory access
Published Jan 17, 2024 · Updated Oct 21, 2025
Memory-buffer bounds errors in Cloud Software Group NetScaler ADC allow remote attackers to interrupt service and read memory. The vendor identifies an out-of-bounds memory operation but has not published the affected request parser, input field, or exact malformed operation. Exploitation requires a customer-managed appliance configured as a Gateway or AAA virtual server; ordinary load-balancing configurations and managed cloud services are outside the reported affected state.
Summary
What happened
Memory-buffer bounds errors in Cloud Software Group NetScaler ADC allow remote attackers to interrupt service and read memory. The vendor identifies an out-of-bounds memory operation but has not published the affected request parser, input field, or exact malformed operation. Exploitation requires a customer-managed appliance configured as a Gateway or AAA virtual server; ordinary load-balancing configurations and managed cloud services are outside the reported affected state.
The record
- CVE
- CVE-2023-6549
- Published
- Jan 17, 2024
- Updated
- Oct 21, 2025
- Vendor
- Cloud Software Group
- Product
- NetScaler ADC
- Classifications
- CWE-119, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 17, 2024Exploitation reportedCISA Known Exploited Vulnerabilities listing
- Jan 17, 2024CVE publishedPublication date reported by the CVE source.
- Oct 21, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=12.1-FIPS <55.302
- Affected versionversion=12.1-NDcPP <55.302
- Affected versionversion=13.0 <92.21
- Affected versionversion=13.1 <51.15
- Affected versionversion=13.1-FIPS <37.176
- Affected versionversion=14.1 <12.35
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- CISA Known Exploited Vulnerabilities listingknown exploited catalog
Technologies
Your stack
See the directory against your own environment.
Your stack
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