# CVE-2025-20393: Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability

> CVE-2025-20393: Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability. CVSS 10.0 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2025-20393
Last updated: 2026-10-07T19:22:07Z

- Published: 2025-12-17 16:47 UTC · Updated: 2026-10-07 19:22 UTC · Assigner: cisco
- CVSS: 10.0 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- EPSS: 32.4%, 98th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2025-12-17, federal due date 2025-12-24, ransomware use: Unknown
- CWE: CWE-20

## 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.

## CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

## Affected vendors and products

- Cisco: Cisco Secure Email
- Cisco: Cisco Secure Email and Web Manager

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-20393)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-20393)
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sma-attack-N9bf4](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sma-attack-N9bf4)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-20393 · Markdown: https://rewindex.com/cve/CVE-2025-20393.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-20393 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:04:51.536Z