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

critical Nessus Plugin ID 303800

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: 1.2

Type: combined

Family: CGI abuses

Published: 3/26/2026

Updated: 3/27/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.3

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2026-3055

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8.1

Threat Vector: CVSS:4.0/E:U

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 Ease: No known exploits are available

Patch Publication Date: 3/23/2026

Vulnerability Publication Date: 3/23/2026

Reference Information

CVE: CVE-2026-3055