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CVE-2026-88779 – Denial of Service (Memory Overflow) – NetScaler ADC and Gateway 14.1/13.1

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Summary

CVE-2026-88779 is a memory overflow vulnerability in Citrix NetScaler ADC and NetScaler Gateway that can be exploited remotely, without authentication, to cause a denial of service. The flaw carries a CVSS score of 8.7 (High) and affects multiple 14.1 and 13.1 release branches, including FIPS builds. Citrix has published fixed builds for all affected branches under advisory CTX697174.

Technical details

  • Root cause: a memory overflow condition in NetScaler ADC/Gateway processing logic that leads to a crash of the affected service.
  • Attack vector: network-based, requiring no authentication, no privileges, and no user interaction, meaning any attacker with network access to the appliance can attempt exploitation.
  • Attack complexity is low, and no special attack requirements must be met for successful exploitation.
  • Impact: the vulnerability affects availability only, with no confidentiality or integrity impact reported — successful exploitation can disrupt or crash the device, resulting in denial of service.

Affected software

  • NetScaler ADC versions before 14.1-73.41
  • NetScaler ADC versions before 13.1-64.28
  • NetScaler ADC 14.1-FIPS versions before 14.1-73.41 FIPS
  • NetScaler ADC 13.1-FIPS/NDcPP versions before 13.1-37.282
  • NetScaler Gateway versions before 14.1-73.41
  • NetScaler Gateway versions before 13.1-64.28

Severity

CVSS v4.0 Base Score: 8.7 (High)
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade NetScaler ADC and NetScaler Gateway to one of the fixed builds — 14.1-73.41 or later, 13.1-64.28 or later, 14.1-73.41 FIPS or later, or 13.1-37.282 or later, as applicable to your branch.
  • If NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server, prioritize patching these instances, consistent with Citrix’s general guidance for NetScaler appliances exposed to untrusted networks.
  • No alternative workaround has been published by Citrix for this issue; upgrading to a fixed build is the recommended remediation.
  • Restrict management and service interfaces of NetScaler appliances from exposure to untrusted networks as a general hardening measure while patching is scheduled.

References

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