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.

CVSS v3.1

10.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

29.88% chance of exploitation in the next 30 days, 98th percentile

CISA KEV

added 2025-12-17

Published

2025-12-17

Updated

2026-02-26

Proof-of-concept exploits (4)

• KingHacker353/CVE-2025-20393
• cyberdudebivash/CYBERDUDEBIVASH-Cisco-AsyncOS-CVE-2025-20393-Scanner
• cyberleelawat/CVE-2025-20393
• redpack-kr/Blackash-CVE-2025-20393

References

• CVE Record
• NVD entry

Related

• CVE-2025-55182
• CVE-2025-55184
• CVE-2025-40602
• CVE-2024-5242
• CVE-2024-5243
• CVE-2024-5244