Risk Letters

Exploited vulnerability

CVE-2026-88772

TLP:CLEAR

Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability

Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for remote code execution or denial of service

Facts

  • Vendor: Citrix
  • Product: NetScaler
  • CVSS: 9.5
  • EPSS (probability of exploitation within 30 days): 78.2 %
  • On CISA's Known Exploited Vulnerabilities list since: 27 September 2026
  • First known exploitation: 27 September 2026
  • CISA's deadline for US federal agencies: 30 September 2026
  • Weakness: CWE-119
  • First seen by Risk Letters: 27 September 2026

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