Cisco Web Security Appliance Stored XSS (cisco-sa-wsa-xss-RuB5WGqL)

medium Nessus Plugin ID 149809
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The remote device is missing a vendor-supplied security patch.


According to its self-reported version, Cisco Web Security Appliance (WSA) is affected by a cross-site scripting (XSS) vulnerability. A vulnerability in the web-based management interface of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against a user of the interface of an affected device. The vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by inserting malicious data into a specific data field in an affected interface. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface. Please see the included Cisco BIDs and Cisco Security Advisory for more information.

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


Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvu22019, CSCvv27761

See Also

Plugin Details

Severity: Medium

ID: 149809

File Name: cisco-sa-wsa-xss-RuB5WGqL.nasl

Version: 1.5

Type: combined

Family: CISCO

Published: 5/20/2021

Updated: 7/15/2021

Dependencies: cisco_wsa_version.nasl

Risk Information

CVSS Score Source: CVE-2021-1271


Risk Factor: Low

Score: 3


Risk Factor: Low

Base Score: 3.5

Temporal Score: 2.6

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

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


Risk Factor: Medium

Base Score: 4.8

Temporal Score: 4.2

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

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

Vulnerability Information

CPE: cpe:/h:cisco:web_security_appliance, cpe:/a:cisco:web_security_appliance, cpe:/o:cisco:web_security_appliance, cpe:/o:cisco:asyncos

Required KB Items: Host/AsyncOS/Cisco Web Security Appliance/DisplayVersion, Host/AsyncOS/Cisco Web Security Appliance/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 1/20/2021

Vulnerability Publication Date: 1/20/2021

Reference Information

CVE: CVE-2021-1271

CISCO-BUG-ID: CSCvu22019, CSCvv27761

CISCO-SA: cisco-sa-wsa-xss-RuB5WGqL

IAVA: 2021-A-0050

CWE: 79