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CVE-2026-20056— Cisco Secure Web Appliance TBD Bypass Vulnerability

Quick assessment

Affected
Cisco Cisco Secure Web Appliance
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Secure Web Appliance是美国思科（Cisco）公司的一个应用程序。用于保护网站。 Cisco Secure Web Appliance存在安全漏洞，该漏洞源于动态矢量和流引擎对某些归档文件处理不当，可能导致绕过反恶意软件扫描器。

CVSS 4.0 · Medium EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-20056

Vulnerability Information
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Vulnerability Title
Cisco Secure Web Appliance TBD Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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. 
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
下载代码缺少完整性检查
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Secure Web Appliance 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Secure Web Appliance是美国思科（Cisco）公司的一个应用程序。用于保护网站。 Cisco Secure Web Appliance存在安全漏洞，该漏洞源于动态矢量和流引擎对某些归档文件处理不当，可能导致绕过反恶意软件扫描器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Secure Web Appliance 11.8.0-453 -

II. Public POCs for CVE-2026-20056

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III. Intelligence Information for CVE-2026-20056

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Same Patch Batch · Cisco · 2026-02-04 · 5 CVEs total

CVE-2026-20098 8.8 HIGH Cisco Meeting Management Arbitrary File Upload Vulnerability
CVE-2026-20119 7.5 HIGH Cisco TelePresence Collaboration Endpoint Software and RoomOS Software Denial of Service V
CVE-2026-20111 4.8 MEDIUM Cisco Prime Infrastructure Stored Cross-Site Scripting Vulnerability
CVE-2026-20123 4.3 MEDIUM Cisco Prime Infrastructure and Evolved Programmable Network Manager Open Redirect Vulnerab

IV. Related Vulnerabilities

Same product: Cisco Secure Web Appliance
Same vendor: Cisco
Same weakness: CWE-494

V. Comments for CVE-2026-20056

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