# CVE-2025-20393

## Summary

- **CVE ID:** CVE-2025-20393
- **Severity:** CRITICAL
- **CVSS Score:** 10 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
- **CWE:** CWE-20
- **Published:** Dec 17, 2025
- **Last Modified:** Feb 26, 2026

## 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

- Cisco — Cisco Secure Email (14.0.0-698)
- Cisco — Cisco Secure Email (13.5.1-277)
- Cisco — Cisco Secure Email (13.0.0-392)
- Cisco — Cisco Secure Email (14.2.0-620)
- Cisco — Cisco Secure Email (13.0.5-007)
- Cisco — Cisco Secure Email (13.5.4-038)
- Cisco — Cisco Secure Email (14.2.1-020)
- Cisco — Cisco Secure Email (14.3.0-032)
- Cisco — Cisco Secure Email (15.0.0-104)
- Cisco — Cisco Secure Email (15.0.1-030)
- Cisco — Cisco Secure Email (15.5.0-048)
- Cisco — Cisco Secure Email (15.5.1-055)
- Cisco — Cisco Secure Email (15.5.2-018)
- Cisco — Cisco Secure Email (16.0.0-050)
- Cisco — Cisco Secure Email (15.0.3-002)
- Cisco — Cisco Secure Email (16.0.0-054)
- Cisco — Cisco Secure Email (15.5.3-022)
- Cisco — Cisco Secure Email (16.0.1-017)
- Cisco — Cisco Secure Email and Web Manager (13.6.2-023)
- Cisco — Cisco Secure Email and Web Manager (13.6.2-078)
- Cisco — Cisco Secure Email and Web Manager (13.0.0-249)
- Cisco — Cisco Secure Email and Web Manager (13.0.0-277)
- Cisco — Cisco Secure Email and Web Manager (13.8.1-052)
- Cisco — Cisco Secure Email and Web Manager (13.8.1-068)
- Cisco — Cisco Secure Email and Web Manager (13.8.1-074)
- Cisco — Cisco Secure Email and Web Manager (14.0.0-404)
- Cisco — Cisco Secure Email and Web Manager (12.8.1-002)
- Cisco — Cisco Secure Email and Web Manager (14.1.0-227)
- Cisco — Cisco Secure Email and Web Manager (13.6.1-201)
- Cisco — Cisco Secure Email and Web Manager (14.2.0-203)
- Cisco — Cisco Secure Email and Web Manager (14.2.0-212)
- Cisco — Cisco Secure Email and Web Manager (12.8.1-021)
- Cisco — Cisco Secure Email and Web Manager (13.8.1-108)
- Cisco — Cisco Secure Email and Web Manager (14.2.0-224)
- Cisco — Cisco Secure Email and Web Manager (14.3.0-120)
- Cisco — Cisco Secure Email and Web Manager (15.0.0-334)
- Cisco — Cisco Secure Email and Web Manager (15.5.1-024)
- Cisco — Cisco Secure Email and Web Manager (15.5.1-029)
- Cisco — Cisco Secure Email and Web Manager (15.5.2-005)
- Cisco — Cisco Secure Email and Web Manager (16.0.0-195)
- Cisco — Cisco Secure Email and Web Manager (15.5.3-017)
- Cisco — Cisco Secure Email and Web Manager (16.0.1-010)
- Cisco — Cisco Secure Email and Web Manager (15.0.1-035)
- Cisco — Cisco Secure Email and Web Manager (16.0.2-088)

## References

- [CNA](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sma-attack-N9bf4)
- [CISA-ADP](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20393)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 29.88%
- **EPSS Percentile:** 98.1

## Known Exploited Vulnerabilities (KEV)

- **Date Added:** Dec 17, 2025
- **Due Date:** Dec 24, 2025

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._