Download of code without integrity check in Cisco AsyncOS for Secure Web Appliance - CVE-2026-20056
Published: February 5, 2026
Vulnerability identifier: #VU122394
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2026-20056
CWE-ID: CWE-494
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco AsyncOS for Secure Web Appliance
Cisco AsyncOS for Secure Web Appliance
Detailed vulnerability description
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.
How to mitigate CVE-2026-20056
Install updates from vendor's website.