CVE-2023-4966

Known Exploited Vulnerability Entry External Catalog

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Entry Details

CVE-2023-4966

Confirmed

Yes

2023-10-18 00:00 UTC

Timestamps

2023-10-18

2023-10-18

Scope

KEV entry: Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability | Affected: Citrix / NetScaler ADC and NetScaler Gateway | Description: Citrix 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. | Required action: Apply 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. | Due date: 2023-11-08 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/, https://support.citrix.com/article/CTX579459/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20234966-and-cve20234967 ; https://nvd.nist.gov/vuln/detail/CVE-2023-4966

References
  • {'id': 'CVE-2023-4966', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-4966'}

23d522b4-421f-473f-bd96-e694bcd6f44e

405284c2-e461-4670-8979-7fd2c9755a60

2026-02-02 13:24 UTC

2026-02-06 07:53 UTC

Evidence (1)
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-119"
  ],
  "date_added": "2023-10-18",
  "due_date": "2023-11-08",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Known",
  "product": "NetScaler ADC and NetScaler Gateway",
  "vendorProject": "Citrix",
  "vulnerabilityName": "Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability"
}
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