CVE-2023-6549Improper 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
Updated under an hour ago ()
Does this affect you?
It affects Cloud Software Group NetScaler ADC and 2 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jan 17, 2024; federal agencies had to remediate by Feb 7, 2024. Treat that date as your deadline.
Do this next
Free account, 1 product
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
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- Weakness (CWE)
- CWE-119
- Known exploited
- Added to CISA KEV Jan 17, 2024; federal remediation due Feb 7, 2024Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 57.63% (percentile 99)
- Assigned by
- Citrix
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Cloud Software Group NetScaler ADC cloud_software_group:netscaler_adc (from the name) | 14.1 builds before 12.35; 13.1 builds before 51.15; 13.0 builds before 92.21; 13.1-FIPS builds before 37.176; 12.1-FIPS builds before 55.302; 12.1-NDcPP builds before 55.302 | CNA record |
citrix netscaler_application_delivery_controller citrix:netscaler_application_delivery_controller | from 12.1 before 12.1-55.302; from 12.1 before 12.1-55.302; from 13.0 before 13.0-92.21; from 13.1 before 13.1-37.176; from 13.1 before 13.1-51.15; from 14.1 before 14.1-12.35 | NVD |
citrix netscaler_gateway citrix:netscaler_gateway | from 13.0 before 13.0-92.21; from 13.1 before 13.1-51.15; from 14.1 before 14.1-12.35 | NVD |
References
- https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-6549us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.