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AlienVault OTX Malware

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.&nbsp;

CVE-2026-20056 is a vulnerability identified in the Dynamic Vectoring and Streaming (DVS) Engine component of Cisco AsyncOS Software used in Cisco Secure Web Appliance products. The flaw arises from improper handling of certain crafted archive files, which allows an unauthenticated, remote attacker to bypass the appliance's anti-malware scanning mechanisms. By sending a specially crafted archive file through the vulnerable device, an attacker can cause the appliance to fail to detect and block malicious content, resulting in the malware being downloaded onto an end user's workstation. The vulnerability does not enable automatic execution of the malware; the end user must manually extract and launch the malicious file for compromise to occur. The vulnerability affects a broad range of Cisco Secure Web Appliance versions spanning multiple releases (from 11.8.0 through 15.5.1). The CVSS v3.1 base score is 4.0 (medium severity), with attack vector network (remote), high attack complexity, no privileges required, no user interaction, and a scope change. The impact is limited to integrity loss (malware delivery bypass), with no direct confidentiality or availability impact. No public exploits or active exploitation have been reported to date. The vulnerability was reserved in October 2025 and published in February 2026. Cisco has not provided patch links in the provided data, so organizations must monitor Cisco advisories for updates. This vulnerability poses a risk of malware infiltration through trusted web security infrastructure, potentially undermining endpoint security postures if exploited.

Detailed information about CVE-2026-20056: Download of Code Without Integrity Check in Cisco Cisco Secure Web Appliance affecting Cisco Cisco Secure Web Applian

CVE-2026-20056: Download of Code Without Integrity Check in Cisco Cisco Secure Web Appliance - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-20056: Download of Code Without Integrity Check in Cisco Cisco Secure Web Appliance

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