CVE-2025-20393
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.
Actively exploited
- In the CISA exploited-vulnerabilities catalogue since Dec 17, 2025
- US federal agencies must remediate it by Dec 24, 2025 (BOD 22-01)
- Attacked 1 day before the vulnerability was made public
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Source: CISA KEV · Apr 8, 2026 Jan 28, 2026 Jan 27, 2026 Jan 20, 2026 Jan 13, 2026 Dec 30, 2025
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HAffected products
| Vendors | Product | Versions |
|---|---|---|
| cisco | asyncos | < 15.0.5-016 |
| cisco | secure email gateway virtual appliance c100v | - |
| cisco | secure email gateway virtual appliance c300v | - |
| cisco | secure email gateway virtual appliance c600v | - |
| cisco | secure email gateway c195 | - |
| cisco | secure email gateway c395 | - |
| cisco | secure email gateway c695 | - |
| cisco | secure email and web manager virtual appliance m100v | - |
| cisco | secure email and web manager virtual appliance m300v | - |
| cisco | secure email and web manager virtual appliance m600v | - |
| cisco | secure email and web manager m170 | - |
| cisco | secure email and web manager m190 | - |
| cisco | secure email and web manager m195 | - |
| cisco | secure email and web manager m380 | - |
| cisco | secure email and web manager m390 | - |
| cisco | secure email and web manager m390x | - |
| cisco | secure email and web manager m395 | - |
| cisco | secure email and web manager m680 | - |
| cisco | secure email and web manager m690 | - |
| cisco | secure email and web manager m690x | - |
| cisco | secure email and web manager m695 | - |
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This product uses the NVD API but is not endorsed or certified by the NVD.