Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
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
What happened
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
CISA lists it as exploited, added 17 Jan 2024.
Does it affect you
Names Citrix NetScaler ADC. Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Follow the vendor advisory for the fixed release and any interim mitigation.
support.citrix.com - Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
cisa.gov
CISA’s notes for this entry:
Affected, as published to NVD
- citrix-adc
- Citrix NetScaler ADC: 12.1 up to the fix in 12.1-55.302
The record
- NVD status
- Analyzed
- Published
- 17 Jan 2024, last modified 17 Jun 2026 (NVD)
- Severity
- CVSS 3.1 base score 7.5, High — computed here from the vector; NVD states 7.5.
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 17 Jan 2024; federal remediation due 07 Feb 2024. CISA entry
- Exploit probability
- EPSS 57.6%, 99th percentile — FIRST, scored 23 Oct 2026. FIRST EPSS
- Vendor
- Citrix · NetScaler ADC and NetScaler Gateway (CISA)
References on the NVD record
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.