Citrix ADC Authentication Bypass (CTX261055)

critical Nessus Plugin ID 149878
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The remote device is affected by multiple vulnerabilities.


An authentication bypass vulnerability exists in Citrix Application Delivery Controller (ADC). An unauthenticated, remote attacker can exploit this, via the web management interface, to bypass authentication and gain administritive access to the appliance.

Note that Nessus has not attempted to exploit these issues but has instead relied only on the application's self-reported version number.


For versions 10.5.x, 11.1.x, 12.0.x, 12.1.x and 13.0.x, upgrade to,,, and, or later, respectively.

See Also

Plugin Details

Severity: Critical

ID: 149878

File Name: citrix_netscaler_CTX261055.nasl

Version: 1.3

Type: combined

Family: CGI abuses

Published: 5/25/2021

Updated: 8/23/2021

Dependencies: citrix_netscaler_detect.nbin

Risk Information

CVSS Score Source: CVE-2019-18225


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: cpe:/h:citrix:netscaler_application_delivery_controller

Required KB Items: Host/NetScaler/Detected

Exploit Ease: No known exploits are available

Patch Publication Date: 10/17/2019

Vulnerability Publication Date: 10/17/2019

Reference Information

CVE: CVE-2019-18225