CVE-2025-20393
Description
A vulnerability in the Spam Quarantine feature of Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager could allow an unauthenticated, remote attacker to execute arbitrary system commands on an affected device with root privileges. This vulnerability is due to insufficient validation of HTTP requests by the Spam Quarantine feature. An attacker could exploit this vulnerability by sending a crafted HTTP request to the affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with root privileges.
How to fix
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 due date: Dec 24, 2025- cisco asyncos15.0.5-016, 15.5.4-012, 16.0.4-016, 15.0.2-007, 15.5.4-007, 16.0.4-010 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cisco asyncos | v < 15.0.5-016, 15.5 ≤ v < 15.5.4-012, 16.0 ≤ v < 16.0.4-016, v < 15.0.2-007, 15.5 ≤ v < 15.5.4-007, 16.0 ≤ v < 16.0.4-010 | 15.0.5-016, 15.5.4-012, 16.0.4-016, 15.0.2-007, 15.5.4-007, 16.0.4-010 |
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