Cisco Secure Web Appliance Content Encoding Filter Bypass (cisco-sa-wsa-bypass-bwBfugek)

medium Nessus Plugin ID 166678


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


According to its self-reported version, Cisco Secure Web Appliance Content Encoding Filter Bypass is affected by a filter bypass vulnerability. An unauthenticated, remote attacker can exploit this, by sending malformed encoded traffic, to bypass an explicit block rule and receive traffic that should have been rejected by the device.

Please see the included Cisco BID and Cisco Security Advisory for more information.


Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwc54898

See Also

Plugin Details

Severity: Medium

ID: 166678

File Name: cisco-sa-wsa-bypass-bwBfugek.nasl

Version: 1.5

Type: combined

Family: CISCO

Published: 10/28/2022

Updated: 10/31/2022

Supported Sensors: Nessus

Risk Information


Risk Factor: Low

Score: 1.4


Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2022-20952


Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

Temporal Vector: CVSS:3.0/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: 10/5/2022

Vulnerability Publication Date: 10/5/2022

Reference Information

CVE: CVE-2022-20952

CWE: 20

CISCO-SA: cisco-sa-wsa-bypass-bwBfugek