Detections
Analytics

Cisco Secure Web Appliance Real-Time Scanning Archive File Bypass (cisco-sa-wsa-archive-bypass-Scx2e8zF)

medium Nessus Plugin ID 298243

Synopsis

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

Description

According to its self-reported version, Cisco Secure Web Appliance Real-Time Scanning Archive File Bypass is affected by a vulnerability.

 - A vulnerability in the Dynamic Vectoring and Streaming (DVS) Engine implementation of Cisco AsyncOS Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass the anti-malware scanner, allowing malicious archive files to be downloaded. This vulnerability is due to improper handling of certain archive files. An attacker could exploit this vulnerability by sending a crafted archive file, which should be blocked, through an affected device. A successful exploit could allow the attacker to bypass the anti-malware scanner and download malware onto an end user workstation.
 The downloaded malware will not automatically execute unless the end user extracts and launches the malicious file. (CVE-2026-20056)

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

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwq69761

See Also

http://www.nessus.org/u?7104852c

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq69761

Plugin Details

Severity: Medium

ID: 298243

File Name: cisco-sa-wsa-archive-bypass-Scx2e8zF.nasl

Version: 1.1

Type: combined

Family: CISCO

Published: 2/6/2026

Updated: 2/6/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.2

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 1.9

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

CVSS Score Source: CVE-2026-20056

CVSS v3

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.5

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

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

Vulnerability Information

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

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: 2/4/2026

Vulnerability Publication Date: 2/4/2026

Reference Information

CVE: CVE-2026-20056

CWE: 494

CISCO-SA: cisco-sa-wsa-archive-bypass-Scx2e8zF

IAVA: 2026-A-0108

CISCO-BUG-ID: CSCwq69761