Risk Letters

Exploited vulnerability

CVE-2023-4966

TLP:CLEAR

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

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.

Facts

  • Vendor: Citrix
  • Product: NetScaler ADC and NetScaler Gateway
  • CVSS: 9.4
  • EPSS (probability of exploitation within 30 days): 100 %
  • On CISA's Known Exploited Vulnerabilities list since: 18 October 2023
  • First known exploitation: 18 October 2023
  • Used in ransomware campaigns (per CISA): Yes
  • CISA's deadline for US federal agencies: 8 November 2023
  • Weakness: CWE-119
  • First seen by Risk Letters: 18 October 2023

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD