SB2026020566 - Antimalware protection bypass in Cisco AsyncOS for Secure Web Appliance
Published: February 5, 2026
Security Bulletin ID
SB2026020566
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Download of code without integrity check (CVE-ID: CVE-2026-20056)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to software does not perform software integrity check in the Dynamic Vectoring and Streaming (DVS) Engine implementation. A remote attacker can use a specially crafted archive to bypass antimalware scanner and download malware onto an end user workstation.
Remediation
Install update from vendor's website.