CVE-2026-88778: TCP Initial Sequence Number (ISN) prediction

Published Sep 27, 2026
·
Updated

Predictable exact value from previous values vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.

This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23.

Affected Software

2 affected components
Citrix NetScaler ADC<14.1-73.37, <13.1-64.23, <13.1.37.279
Citrix NetScaler Gateway<14.1-73.37, <13.1-64.23

Event History

Sep 27, 2026
CVE Published
via MITRE·04:43 PM
Data Sourced
via MITRE·04:43 PM
DescriptionWeakness
Data Sourced
via NVD·05:16 PM
DescriptionSeverityWeakness

Frequently Asked Questions

1

Which product versions need to be updated?

Citrix NetScaler ADC is affected before 14.1-73.37 and 13.1-64.23. ADC FIPS is affected before 14.1-73.37 FIPS, while ADC 13.1 FIPS and NDcPP is affected before 13.1.37.279; NetScaler Gateway is affected before 14.1-73.37 and 13.1-64.23.

Contact

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