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.
CVSS Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Threat Intelligence
- Added
- Dec 17, 2025
- Due
- Dec 24, 2025
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weaknesses 1
Affected Products 26
| Vendor | Product | Version | Range |
|---|---|---|---|
| cisco | asyncos | * | <15.0.5-016 |
| cisco | asyncos | * | ≥15.5 – <15.5.4-012 |
| cisco | asyncos | * | ≥16.0 – <16.0.4-016 |
| cisco | secure_email_gateway_virtual_appliance_c100v | * | any |
| cisco | secure_email_gateway_virtual_appliance_c300v | * | any |
| cisco | secure_email_gateway_virtual_appliance_c600v | * | any |
| cisco | secure_email_gateway_c195 | * | any |
| cisco | secure_email_gateway_c395 | * | any |
| cisco | secure_email_gateway_c695 | * | any |
| cisco | asyncos | * | <15.0.2-007 |
| cisco | asyncos | * | ≥15.5 – <15.5.4-007 |
| cisco | asyncos | * | ≥16.0 – <16.0.4-010 |
| cisco | secure_email_and_web_manager_virtual_appliance_m100v | * | any |
| cisco | secure_email_and_web_manager_virtual_appliance_m300v | * | any |
| cisco | secure_email_and_web_manager_virtual_appliance_m600v | * | any |
| cisco | secure_email_and_web_manager_m170 | * | any |
| cisco | secure_email_and_web_manager_m190 | * | any |
| cisco | secure_email_and_web_manager_m195 | * | any |
| cisco | secure_email_and_web_manager_m380 | * | any |
| cisco | secure_email_and_web_manager_m390 | * | any |
| cisco | secure_email_and_web_manager_m390x | * | any |
| cisco | secure_email_and_web_manager_m395 | * | any |
| cisco | secure_email_and_web_manager_m680 | * | any |
| cisco | secure_email_and_web_manager_m690 | * | any |
| cisco | secure_email_and_web_manager_m690x | * | any |
| cisco | secure_email_and_web_manager_m695 | * | any |
References 2
- sec.cloudapps.cisco.com https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sma-attack-N9bf4
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20393
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.