CVE-2026-88778

TCP Initial Sequence Number (ISN) prediction

State: Published
Severity: 8.8 High
Published: Sep 27, 2026
Updated: Sep 29, 2026
Reserved: Sep 10, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.8 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:L/SI:L/SA:L	NetScaler

Weaknesses

CWE-342 Predictable exact value from previous values

Affected Products

Product	Versions
ADCCitrix NetScaler	before 14.1-73.37Affected before 13.1-64.23Affected before 14.1-73.37 FIPSAffected before 13.1.37.279 FIPS and NDcPPAffected
GatewayCitrix NetScaler	before 14.1-73.37Affected before 13.1-64.23Affected

References

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.