critical10.0Known exploited
CVE-2025-20393
Cisco Multiple Products Improper Input Validation Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2025-12-17. Federal due date: 2025-12-24.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Cisco | Asyncos | before 15.0.5-016 from 15.5 before 15.5.4-012 from 16.0 before 16.0.4-016 before 15.0.2-007 from 15.5 before 15.5.4-007 from 16.0 before 16.0.4-010 |