CVE-2025-20393: Technical Deep-Dive (Auto Refreshed)

Generated on 2026-03-23T21:24:54.320Z. This file is automatically regenerated every 30 minutes by the CVE AI enrichment job using web sources (NVD, MITRE, CISA KEV, GitHub).

Executive Technical Summary

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.

• Context preserved from previous revision: 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. 1. Use only isolated environments and systems you own or are explicitly authorized to test.

Technical Details

• CVE: CVE-2025-20393
• KEV date added: Unknown
• KEV due date: Not specified
• NVD published: 2025-12-17
• NVD modified: 2026-01-16
• MITRE modified: 2026-02-26
• CVSS base score: 10
• CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
• CVSS exploitability score: 3.9
• CVSS impact score: 6
• Attack vector: Network
• Attack complexity: Low
• Privileges required: None
• User interaction: None
• Scope: Changed
• Confidentiality impact: High
• Integrity impact: High
• Availability impact: High

Versions and Products Impacted

• cisco / asyncos (versions: < 15.0.5-016)
• cisco / asyncos (versions: >= 15.5, < 15.5.4-012)
• cisco / asyncos (versions: >= 16.0, < 16.0.4-016)
• cisco / asyncos (versions: < 15.0.2-007)
• cisco / asyncos (versions: >= 15.5, < 15.5.4-007)
• cisco / asyncos (versions: >= 16.0, < 16.0.4-010)
• Cisco / Cisco Secure Email (versions: 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)
• Cisco / Cisco Secure Email and Web Manager (versions: 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)

Weakness Classification

• CWE-20

Repositories for Lab Validation (Public Examples)

• nomi-sec/PoC-in-GitHub | stars: 7594 | updated: 2026-03-23 | https://github.com/nomi-sec/PoC-in-GitHub
  Notes: 📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
• DarkFunct/TK-CVE-Repo | stars: 43 | updated: 2026-03-23 | https://github.com/DarkFunct/TK-CVE-Repo
  Notes: TK-CVE-Repo

People and Organizations Mentioned

• cisco
• nomi-sec
• DarkFunct

Practical Defensive Validation (Authorized Only)

1. Use only isolated environments and systems you own or are explicitly authorized to test.
2. Snapshot infrastructure before validation and preserve baseline logs (EDR, SIEM, OS, app).
3. Inventory cisco / asyncos (versions: < 15.0.5-016) assets and confirm exact vulnerable versions with automated checks.
4. Patch in staged environments and validate closure with scanners + service health checks.
5. Map detections to MITRE ATT&CK tactics relevant to your environment and tune alert quality.

References

• NVD record: https://nvd.nist.gov/vuln/detail/CVE-2025-20393
• MITRE CVE record: https://www.cve.org/CVERecord?id=CVE-2025-20393
• CISA KEV Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• CISA KEV JSON feed: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sma-attack-N9bf4
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20393
• Repository example: https://github.com/nomi-sec/PoC-in-GitHub
• Repository example: https://github.com/DarkFunct/TK-CVE-Repo

This content is for defensive security training and authorized validation only.