CVEvulnerability
CVE-2025-20393
CISA Known Exploited Vulnerability
Cisco Multiple Products Improper Input Validation Vulnerability — Cisco Multiple Products
Cisco Secure Email Gateway, Secure Email, AsyncOS Software, and Web Manager appliances contains an improper input validation vulnerability that allows threat actors to execute arbitrary commands with root privileges on the underlying operating system of an affected appliance.
- Added to KEV
- 2025-12-17
- Remediation due
- 2025-12-24
- Ransomware use
- Unknown
- 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.
- Notes
- Please adhere to Cisco's guidelines to assess exposure and mitigate risks. Check for signs of potential compromise on all internet accessible Cisco products affected by this vulnerability. Apply any final mitigations provided by the vendor as soon as they become available. For more information please see: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sma-attack-N9bf4 ; https://nvd.nist.gov/vuln/detail/CVE-2025-20393
- Status
- Analyzed
- Published
- 2025-12-17
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 10.0 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weaknesses
- 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.
Affected configurations
• cisco asyncos (< 15.0.5-016)
• cisco asyncos (>= 15.5 < 15.5.4-012)
• cisco asyncos (>= 16.0 < 16.0.4-016)
• cisco asyncos (< 15.0.2-007)
• cisco asyncos (>= 15.5 < 15.5.4-007)
• cisco asyncos (>= 16.0 < 16.0.4-010)
Related
Weakness · CWE (1)
- CWE-20 Improper Input Validation weakness