Vulnerability Monitor

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CVE-2025-20393

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.

Security Impact Summary

This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 10.0, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 21 products from cisco, from cisco, from cisco and 18 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2025, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2025-12-17T17:15:48.523

Last Modified

2026-01-16T14:00:12.647

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 10.0 (CRITICAL)

Weaknesses

Type: Secondary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	cisco	asyncos	< 15.0.5-016	Yes
Operating System	cisco	asyncos	< 15.5.4-012	Yes
Operating System	cisco	asyncos	< 16.0.4-016	Yes
Application	cisco	secure_email_gateway_virtual_appliance_c100v	-	No
Application	cisco	secure_email_gateway_virtual_appliance_c300v	-	No
Application	cisco	secure_email_gateway_virtual_appliance_c600v	-	No
Hardware	cisco	secure_email_gateway_c195	-	No
Hardware	cisco	secure_email_gateway_c395	-	No
Hardware	cisco	secure_email_gateway_c695	-	No
Operating System	cisco	asyncos	< 15.0.2-007	Yes
Operating System	cisco	asyncos	< 15.5.4-007	Yes
Operating System	cisco	asyncos	< 16.0.4-010	Yes
Application	cisco	secure_email_and_web_manager_virtual_appliance_m100v	-	No
Application	cisco	secure_email_and_web_manager_virtual_appliance_m300v	-	No
Application	cisco	secure_email_and_web_manager_virtual_appliance_m600v	-	No
Hardware	cisco	secure_email_and_web_manager_m170	-	No
Hardware	cisco	secure_email_and_web_manager_m190	-	No
Hardware	cisco	secure_email_and_web_manager_m195	-	No
Hardware	cisco	secure_email_and_web_manager_m380	-	No
Hardware	cisco	secure_email_and_web_manager_m390	-	No
Hardware	cisco	secure_email_and_web_manager_m390x	-	No
Hardware	cisco	secure_email_and_web_manager_m395	-	No
Hardware	cisco	secure_email_and_web_manager_m680	-	No
Hardware	cisco	secure_email_and_web_manager_m690	-	No
Hardware	cisco	secure_email_and_web_manager_m690x	-	No
Hardware	cisco	secure_email_and_web_manager_m695	-	No

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sma-attack-N9bf4 Vendor Advisory ([email protected])
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20393 US Government Resource (134c704f-9b21-4f2e-91b3-4a467353bcc0)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.