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NetScaler ADC and NetScaler Gateway Memory Overread (CTX696300 / CVE-2026-3055)

critical Nessus Plugin ID 303800

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Synopsis

The remote device is affected by a memory overread vulnerability.

Description

The remote NetScaler ADC (formerly Citrix ADC) or NetScaler Gateway (formerly Citrix Gateway) device is version 14.1 prior to 14.1-66.59, 13.1 prior to 13.1-62.23, or 13.1-FIPS/NDcPP prior to 13.1-37.262. It is, therefore, affected by a vulnerability:

 - Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread. (CVE-2026-3055)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to NetScaler ADC or NetScaler Gateway version 13.1-62.23, 14.1-66.59, 13.1-37.262-FIPS, or 13.1-37.262-NDcPP or later.

See Also

http://www.nessus.org/u?a635125d

Plugin Details

Severity: Critical

ID: 303800

File Name: netscaler_adc_gateway_CTX696300_CVE-2026-3055.nasl

Version: 1.6

Type: Combined

Family: CGI abuses

Published: 3/26/2026

Updated: 4/1/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-3055

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 9.3

Threat Vector: CVSS:4.0/E:A

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

Vulnerability Information

CPE: cpe:/h:citrix:netscaler_gateway, cpe:/h:citrix:netscaler_application_delivery_controller

Required KB Items: Host/NetScaler/Detected

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/23/2026

Vulnerability Publication Date: 3/23/2026

CISA Known Exploited Vulnerability Due Dates: 4/2/2026

Reference Information

CVE: CVE-2026-3055

IAVA: 2026-A-0264