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CVE-2026-88775 – Denial of Service (Memory Overflow) – NetScaler ADC and NetScaler Gateway 14.1 / 13

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Summary

CVE-2026-88775 is a memory overflow vulnerability in Citrix NetScaler ADC and NetScaler Gateway that can cause unpredictable appliance behavior or denial of service. It affects appliances configured as a Gateway (SSL VPN, ICA Proxy, CVPN, or RDP Proxy) or as an authentication, authorization, and auditing (AAA) virtual server. The flaw carries a CVSS score of 8.8 and was disclosed alongside several other NetScaler vulnerabilities, including two zero-days that Citrix confirmed were being actively exploited (CVE-2026-88771 and CVE-2026-88772); CVE-2026-88775 itself was not listed by Citrix as exploited in the wild at time of disclosure.

Technical details

  • Root cause: A memory overflow condition within NetScaler processing logic.
  • Trigger conditions: The appliance must be configured as a Gateway (SSL VPN, ICA Proxy, CVPN, or RDP Proxy) or have an AAA virtual server configured.
  • Attack vector: Network-based, requiring no authentication or user interaction.
  • Impact: Unpredictable appliance behavior or denial of service (availability impact); no code execution has been confirmed for this specific CVE.

Affected software

  • Citrix NetScaler ADC and NetScaler Gateway versions before 14.1-73.37
  • Citrix NetScaler ADC and NetScaler Gateway 13.1 versions before 13.1-64.23
  • Citrix NetScaler ADC 14.1-FIPS versions before 14.1-73.37 FIPS
  • Citrix NetScaler ADC 13.1-FIPS and 13.1-NDcPP versions before 13.1-37.279

Severity

  • CVSS v4.0 Base Score: 8.8 (High)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade to the fixed builds:
    • NetScaler ADC and NetScaler Gateway 14.1-73.37 or later
    • NetScaler ADC and NetScaler Gateway 13.1-64.23 or later
    • NetScaler ADC 14.1-FIPS 14.1-73.37 or later
    • NetScaler ADC 13.1-FIPS and 13.1-NDcPP 13.1-37.279 or later
  • If patching cannot be performed immediately: No official workaround has been published for this vulnerability; restrict network exposure of Gateway and AAA virtual servers to trusted sources where possible until the patch can be applied, and monitor Citrix’s advisory for updates.

References

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