Oct 19, 2026 · 17:40 UTC SEARCH
UNRATED KNOWN EXPLOITED
Vulnerability intelligence

CVE-2025-20393

VendorCisco
ProductMultiple Products
Known exploitedYes
Added to CISA KEVDecember 17, 2025
KEV due dateDecember 24, 2025
Known ransomware useNot identified by CISA

Cisco Secure Email Gateway, Secure Email, AsyncOS Software, and Web Manager appliances contains an improper input validation vulnerability that allows threat actors to execute arbitrary commands with root privileges on the underlying operating system of an affected appliance.

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA KEV status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities Catalog. Known ransomware campaign use: Unknown.

Stay Ahead of the Threat Landscape

Breach intelligence, vulnerability alerts, and original analysis — delivered as it happens.