CVE-2026-20056

Cisco Secure Web Appliance TBD Bypass Vulnerability

Published Feb 4, 2026 CVSS 3.1 · 4 Medium EPSS < 1% KEV · Not listed

Description

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. 

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Secure Web Appliance

unknown

Version	Status	Constraints
`11.8.0-453`	affected	—
`12.5.3-002`	affected	—
`12.0.3-007`	affected	—
`12.0.3-005`	affected	—
`14.1.0-032`	affected	—
`14.1.0-047`	affected	—
`14.1.0-041`	affected	—
`12.0.4-002`	affected	—
`14.0.2-012`	affected	—
`11.8.0-414`	affected	—
`12.0.1-268`	affected	—
`11.8.1-023`	affected	—
`11.8.3-021`	affected	—
`11.8.3-018`	affected	—
`12.5.1-011`	affected	—
`11.8.4-004`	affected	—
`12.5.2-007`	affected	—
`12.5.2-011`	affected	—
`14.5.0-498`	affected	—
`12.5.4-005`	affected	—
`12.5.4-011`	affected	—
`12.0.5-011`	affected	—
`14.0.3-014`	affected	—
`12.5.5-004`	affected	—
`12.5.5-005`	affected	—
`12.5.5-008`	affected	—
`14.0.4-005`	affected	—
`14.5.1-008`	affected	—
`14.5.1-016`	affected	—
`15.0.0-355`	affected	—
`15.0.0-322`	affected	—
`12.5.6-008`	affected	—
`15.1.0-287`	affected	—
`14.5.2-011`	affected	—
`15.2.0-116`	affected	—
`14.0.5-007`	affected	—
`15.2.0-164`	affected	—
`14.5.1-510`	affected	—
`12.0.2-012`	affected	—
`12.0.2-004`	affected	—
`14.5.1-607`	affected	—
`14.5.3-033`	affected	—
`15.0.1-004`	affected	—
`15.2.1-011`	affected	—
`14.5.0-673`	affected	—
`14.5.0-537`	affected	—
`12.0.1-334`	affected	—
`14.0.1-503`	affected	—
`14.0.1-053`	affected	—
`11.8.0-429`	affected	—
`14.0.1-040`	affected	—
`14.0.1-014`	affected	—
`12.5.1-043`	affected	—
`15.2.2-009`	affected	—
`15.5.0-566`	affected	—
`15.2.3-007`	affected	—
`15.5.0-574`	affected	—
`15.5.0-710`	affected	—
`15.2.4-022`	affected	—
`15.5.1-002`	affected	—

No data.

Vendor	Product	Versions
Cisco	Secure Web Appliance	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.166% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-archive-bypass-Scx2e8zF

History

Feb 4, 2026 9:30 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco secure Web Appliance
Vendors & Products		Cisco Cisco secure Web Appliance

Feb 4, 2026 5:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Feb 4, 2026 4:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		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.
Title		Cisco Secure Web Appliance TBD Bypass Vulnerability
Weaknesses		CWE-494
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-archive-bypass-Scx2e8zF
Metrics		cvssV3_1 `{'score': 4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N'}`