Vulnerability · Published Feb 4, 2026 · Assigned by cisco
CVE-2026-20056Cisco Secure Web Appliance TBD Bypass Vulnerability
Medium 4.0
In plain English
A medium-severity security flaw in Cisco Secure Web Appliance from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Secure Web Appliance | 11.8.0-45312.5.3-00212.0.3-00712.0.3-00514.1.0-03214.1.0-04714.1.0-04112.0.4-002 |
Weakness: CWE-494 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N