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CVE-2026-88773

Citrix NetScaler Gateway vulnerability

10.0 CRITICALEPSS 0.36%
  1. Published27 Sept 2026

Description

Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') 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 and NDcPP; Gateway: before 14.1-73.37 FIPS and before 13.1-64.23.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Affected products

Citrix NetScaler Application Delivery Controller≥ 13.1 < 13.1-64.23 · ≥ 14.1 < 14.1-73.37 · ≥ 13.1 < 13.1.37.279 · ≥ 14.1-66.68 ≤ 14.1-73.37
Citrix NetScaler Gateway≥ 13.1 < 13.1-64.23 · ≥ 14.1 < 14.1-73.37

Remediation

Fixed in
Citrix NetScaler Application Delivery Controller≥ 13.1-64.23
Citrix NetScaler Gateway≥ 13.1-64.23

References

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Frequently asked

Is CVE-2026-88773 being actively exploited?

CVE-2026-88773 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.36%.

How severe is CVE-2026-88773?

CVE-2026-88773 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.36% probability of exploitation.

Which products are affected by CVE-2026-88773?

Affected products include Citrix NetScaler Application Delivery Controller, Citrix NetScaler Gateway.

How do I fix CVE-2026-88773?

Upgrade affected software to a fixed version, for example Citrix NetScaler Application Delivery Controller 13.1-64.23, Citrix NetScaler Gateway 13.1-64.23 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.