Citrix ADC and Citrix NetScaler Gateway Multiple Vulnerabilities (CTX330728)

high Nessus Plugin ID 155584



The remote device is affected by multiple vulnerabilities.


The remote Citrix ADC or Citrix NetScaler Gateway device is version 11.1.x prior to, 12.1.x prior to, 13.0.x prior to, or 13.1.x prior to It is, therefore, affected by multiple vulnerabilities:

- Unauthenticated denial of service (CVE-2021-22955)

- Temporary disruption of the Management GUI, Nitro API and RPC communication (CVE-2021-22956)

Please refer to advisory CTX330728 for more information.

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


For versions 11.1.x, 12.1.x, 13.0.x, and 13.1.x, upgrade to,,, and, or later, respectively.

See Also

Plugin Details

Severity: High

ID: 155584

File Name: citrix_netscaler_CTX330728.nasl

Version: 1.4

Type: combined

Family: CGI abuses

Published: 11/18/2021

Updated: 12/9/2021

Risk Information

CVSS Score Source: CVE-2021-22956


Risk Factor: Low

Score: 3.6


Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

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


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:N/I:N/A:H

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

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: 11/9/2021

Vulnerability Publication Date: 11/9/2021

Reference Information

CVE: CVE-2021-22955, CVE-2021-22956

IAVA: 2021-A-0553