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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Cisco | Cisco Secure Email | 14.0.0-698, 13.5.1-277, 13.0.0-392, 14.2.0-620, 13.0.5-007, 13.5.4-038, 14.2.1-020, 14.3.0-032, 15.0.0-104, 15.0.1-030, 15.5.0-048, 15.5.1-055, 15.5.2-018, 16.0.0-050, 15.0.3-002, 16.0.0-054, 15.5.3-022, 16.0.1-017 | — |
| Cisco | Cisco Secure Email and Web Manager | 13.6.2-023, 13.6.2-078, 13.0.0-249, 13.0.0-277, 13.8.1-052, 13.8.1-068, 13.8.1-074, 14.0.0-404, 12.8.1-002, 14.1.0-227, 13.6.1-201, 14.2.0-203, 14.2.0-212, 12.8.1-021, 13.8.1-108, 14.2.0-224, 14.3.0-120, 15.0.0-334, 15.5.1-024, 15.5.1-029, 15.5.2-005, 16.0.0-195, 15.5.3-017, 16.0.1-010, 15.0.1-035,… | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 5 repositories
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StasonJatham/cisco-sa-sma-attack-N9bf4 ★ 22 · Dec 18, 2025
Script to detect CVE-2025-20393 for Cisco Secure Email Gateway And Cisco Secure Email and Web Manager
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cyberleelawat/CVE-2025-20393 ★ 2 · Dec 18, 2025
Cisco is aware of a potential vulnerability. Cisco is currently investigating and will update these details as appropriate as more information becomes available.
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cyberdudebivash/CYBERDUDEBIVASH-Cisco-AsyncOS-CVE-2025-20393-Scanner ★ 0 · Jan 16, 2026
This tool helps identify exposure to CVE-2025-20393 by checking for open TCP/6025 ports, responsive Spam Quarantine interfaces, and known post-exploitation IOCs.
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redpack-kr/Blackash-CVE-2025-20393 ★ 0 · Dec 28, 2025
CVE-2025-20393
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KingHacker353/CVE-2025-20393 ★ 0 · Dec 18, 2025
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- WID-SEC-2025-2870 Cisco AsyncOS für Secure Email Gateway: Schwachstelle ermöglicht Ausführen von beliebigem Programmcode mit Administratorrechten BSI CERT-Bund (WID) · Jan 15, 2026
- NCSC-2025-0398 Kwetsbaarheid in Cisco AsyncOS NCSC-NL (Netherlands) · Dec 17, 2025