CVE-2023-4966
Citrix NetScaler ADC and NetScaler Gateway: Improper Restriction of Operations within Memory Bounds
- Act now
- CVSS 9.4 Critical
- CISA KEV, due
- VulnCheck KEV
- ENISA exploited-vulnerability catalog
What it is
ReportedCitrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for sensitive information disclosure when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.
Dates
What is affected
ReportedCitrix; NetScaler ADC and NetScaler Gateway. Product-level identification only; no affected-version conclusion is available from this field.
Dates
Urgency and basis
Tracker computedAct now
Current priority score and EPSS: loading from the tracker record. They are read when this page loads and are not shown without JavaScript. They change daily and are not part of "Source last updated".
Dates
Exploitation evidence
ReportedActive exploitation · CISA KEV · VulnCheck KEV · ENISA exploited-vulnerability catalog
Dates
What to do
ReportedApply mitigations and kill all active and persistent sessions per vendor instructions [https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/] OR discontinue use of the product if mitigations are unavailable.
Source remediation ↗Dates
Detection and validation
Mapped metadata availability only. These signals do not change priority.
Sigma
Winnti Pipemon Characteristics. Level: critical. Status: stable.
Open Sigma metadataAtomic
Copy Apple Notes database files using AppleScript. Executor: sh. Elevation: not required.
Open Atomic metadataNuclei
Citrix Bleed - Leaking Session Tokens. Check identifier: CVE-2023-4966.
Open Nuclei metadata
Evidence detail
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