Risk Letters

Exploited vulnerability

CVE-2026-88779

TLP:CLEAR

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

Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.

Facts

  • Vendor: Citrix
  • Product: NetScaler
  • CVSS: 8.7
  • EPSS (probability of exploitation within 30 days): 11.4 %
  • On CISA's Known Exploited Vulnerabilities list since: 4 October 2026
  • First known exploitation: 2 October 2026
  • CISA's deadline for US federal agencies: 7 October 2026
  • Weakness: CWE-119
  • First seen by Risk Letters: 4 October 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

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