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Citrix Products Denial of Service Vulnerability

CVE-2026-88779

October 5, 2026 · HKCERT · Severity: HIGH

This article reports a denial of service vulnerability in Citrix NetScaler ADC and Gateway products, tracked as CVE-2026-88779. The flaw is being actively exploited in the wild and can be triggered remotely to crash the targeted system. Affected versions include multiple branches of Citrix NetScaler ADC and Gateway, and the vendor has released patches. 📌 **Analyst Note:** Active exploitation of this DoS vulnerability underscores the urgency for patching, as attackers can disrupt critical network infrastructure. Organizations should prioritize updating Citrix NetScaler appliances and monitor for signs of denial of service attacks.

Key Takeaways

  • A denial of service vulnerability identified in Citrix NetScaler ADC and Gateway products allows remote attackers to crash targeted systems without authentication.
  • CVE-2026-88779 is actively exploited in the wild, stemming from a memory handling flaw that can be triggered by specially crafted requests.
  • Organizations running affected versions must immediately apply vendor-supplied patches to prevent service disruption and potential exploitation.
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