CVE-2025-20393

Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability

Published Dec 17, 2025 CVSS 3.1 · 10 Critical EPSS 32.4% KEV · Listed

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

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Secure Email

unknown

Version	Status	Constraints
`14.0.0-698`	affected	—
`13.5.1-277`	affected	—
`13.0.0-392`	affected	—
`14.2.0-620`	affected	—
`13.0.5-007`	affected	—
`13.5.4-038`	affected	—
`14.2.1-020`	affected	—
`14.3.0-032`	affected	—
`15.0.0-104`	affected	—
`15.0.1-030`	affected	—
`15.5.0-048`	affected	—
`15.5.1-055`	affected	—
`15.5.2-018`	affected	—
`16.0.0-050`	affected	—
`15.0.3-002`	affected	—
`16.0.0-054`	affected	—
`15.5.3-022`	affected	—
`16.0.1-017`	affected	—

Cisco

Cisco Secure Email and Web Manager

unknown

Version	Status	Constraints
`13.6.2-023`	affected	—
`13.6.2-078`	affected	—
`13.0.0-249`	affected	—
`13.0.0-277`	affected	—
`13.8.1-052`	affected	—
`13.8.1-068`	affected	—
`13.8.1-074`	affected	—
`14.0.0-404`	affected	—
`12.8.1-002`	affected	—
`14.1.0-227`	affected	—
`13.6.1-201`	affected	—
`14.2.0-203`	affected	—
`14.2.0-212`	affected	—
`12.8.1-021`	affected	—
`13.8.1-108`	affected	—
`14.2.0-224`	affected	—
`14.3.0-120`	affected	—
`15.0.0-334`	affected	—
`15.5.1-024`	affected	—
`15.5.1-029`	affected	—
`15.5.2-005`	affected	—
`16.0.0-195`	affected	—
`15.5.3-017`	affected	—
`16.0.1-010`	affected	—
`15.0.1-035`	affected	—
`16.0.2-088`	affected	—

Configuration 1 [-]

AND

OR	cpe:2.3:o:cisco:asyncos::::::::
	cpe:2.3:o:cisco:asyncos::::::::
	cpe:2.3:o:cisco:asyncos::::::::

OR	cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c100v:-:::::::*
	cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c300v:-:::::::*
	cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c600v:-:::::::*
	cpe:2.3:h:cisco:secure_email_gateway_c195:-:::::::*
	cpe:2.3:h:cisco:secure_email_gateway_c395:-:::::::*
	cpe:2.3:h:cisco:secure_email_gateway_c695:-:::::::*

Configuration 2 [-]

AND

OR	cpe:2.3:o:cisco:asyncos::::::::
	cpe:2.3:o:cisco:asyncos::::::::
	cpe:2.3:o:cisco:asyncos::::::::

OR	cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m100v:-:::::::*
	cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m300v:-:::::::*
	cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m600v:-:::::::*
	cpe:2.3:h:cisco:secure_email_and_web_manager_m170:-:::::::*
	cpe:2.3:h:cisco:secure_email_and_web_manager_m190:-:::::::*
	cpe:2.3:h:cisco:secure_email_and_web_manager_m195:-:::::::*
	cpe:2.3:h:cisco:secure_email_and_web_manager_m380:-:::::::*
	cpe:2.3:h:cisco:secure_email_and_web_manager_m390:-:::::::*
	cpe:2.3:h:cisco:secure_email_and_web_manager_m390x:-:::::::*
	cpe:2.3:h:cisco:secure_email_and_web_manager_m395:-:::::::*
	cpe:2.3:h:cisco:secure_email_and_web_manager_m680:-:::::::*
	cpe:2.3:h:cisco:secure_email_and_web_manager_m690:-:::::::*
	cpe:2.3:h:cisco:secure_email_and_web_manager_m690x:-:::::::*
	cpe:2.3:h:cisco:secure_email_and_web_manager_m695:-:::::::*

No data.

Vendor	Product	Versions
Cisco	Secure Email	—
Cisco	Secure Email And Web Manager	—
Cisco	Secure Email Gateway	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is in the KEV database since Dec. 17, 2025.

Exploit prediction score: 32.4% (32.392% probability within 30 days)

Exploitation active

Automatable yes

Technical Impact total

References

Link	Providers
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

History

Jan 15, 2026 5:00 PM Description updated View changes

Type	Values Removed	Values Added
Description	Cisco is aware of a potential vulnerability.  Cisco is currently investigating and will update these details as appropriate as more information becomes available.	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.

Dec 18, 2025 3:45 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco asyncos Cisco secure Email And Web Manager M170 Cisco secure Email And Web Manager M190 Cisco secure Email And Web Manager M195 Cisco secure Email And Web Manager M380 Cisco secure Email And Web Manager M390 Cisco secure Email And Web Manager M390x Cisco secure Email And Web Manager M395 Cisco secure Email And Web Manager M680 Cisco secure Email And Web Manager M690 Cisco secure Email And Web Manager M690x Cisco secure Email And Web Manager M695 Cisco secure Email And Web Manager Virtual Appliance M100v Cisco secure Email And Web Manager Virtual Appliance M300v Cisco secure Email And Web Manager Virtual Appliance M600v Cisco secure Email Gateway C195 Cisco secure Email Gateway C395 Cisco secure Email Gateway C695 Cisco secure Email Gateway Virtual Appliance C100v Cisco secure Email Gateway Virtual Appliance C300v Cisco secure Email Gateway Virtual Appliance C600v
CPEs		cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m100v:-:::::::* cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m300v:-:::::::* cpe:2.3:a:cisco:secure_email_and_web_manager_virtual_appliance_m600v:-:::::::* cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c100v:-:::::::* cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c300v:-:::::::* cpe:2.3:a:cisco:secure_email_gateway_virtual_appliance_c600v:-:::::::* cpe:2.3:h:cisco:secure_email_and_web_manager_m170:-:::::::* cpe:2.3:h:cisco:secure_email_and_web_manager_m190:-:::::::* cpe:2.3:h:cisco:secure_email_and_web_manager_m195:-:::::::* cpe:2.3:h:cisco:secure_email_and_web_manager_m380:-:::::::* cpe:2.3:h:cisco:secure_email_and_web_manager_m390:-:::::::* cpe:2.3:h:cisco:secure_email_and_web_manager_m390x:-:::::::* cpe:2.3:h:cisco:secure_email_and_web_manager_m395:-:::::::* cpe:2.3:h:cisco:secure_email_and_web_manager_m680:-:::::::* cpe:2.3:h:cisco:secure_email_and_web_manager_m690:-:::::::* cpe:2.3:h:cisco:secure_email_and_web_manager_m690x:-:::::::* cpe:2.3:h:cisco:secure_email_and_web_manager_m695:-:::::::* cpe:2.3:h:cisco:secure_email_gateway_c195:-:::::::* cpe:2.3:h:cisco:secure_email_gateway_c395:-:::::::* cpe:2.3:h:cisco:secure_email_gateway_c695:-:::::::* cpe:2.3:o:cisco:asyncos::::::::
Vendors & Products		Cisco asyncos Cisco secure Email And Web Manager M170 Cisco secure Email And Web Manager M190 Cisco secure Email And Web Manager M195 Cisco secure Email And Web Manager M380 Cisco secure Email And Web Manager M390 Cisco secure Email And Web Manager M390x Cisco secure Email And Web Manager M395 Cisco secure Email And Web Manager M680 Cisco secure Email And Web Manager M690 Cisco secure Email And Web Manager M690x Cisco secure Email And Web Manager M695 Cisco secure Email And Web Manager Virtual Appliance M100v Cisco secure Email And Web Manager Virtual Appliance M300v Cisco secure Email And Web Manager Virtual Appliance M600v Cisco secure Email Gateway C195 Cisco secure Email Gateway C395 Cisco secure Email Gateway C695 Cisco secure Email Gateway Virtual Appliance C100v Cisco secure Email Gateway Virtual Appliance C300v Cisco secure Email Gateway Virtual Appliance C600v

Dec 17, 2025 9:30 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Cisco Cisco secure Email Cisco secure Email And Web Manager Cisco secure Email Gateway
Vendors & Products		Cisco Cisco secure Email Cisco secure Email And Web Manager Cisco secure Email Gateway

Dec 17, 2025 9:15 PM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20393
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Dec 17, 2025 9:00 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		kev `{'dateAdded': '2025-12-17T00:00:00+00:00', 'dueDate': '2025-12-24T00:00:00+00:00'}`

Dec 17, 2025 5:00 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		Cisco is aware of a potential vulnerability.  Cisco is currently investigating and will update these details as appropriate as more information becomes available.
Title		Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability
Weaknesses		CWE-20
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sma-attack-N9bf4
Metrics		cvssV3_1 `{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}`

Earlier changes (1)

Subscriptions

Cisco Asyncos Secure Email Secure Email And Web Manager Secure Email And Web Manager M170 Secure Email And Web Manager M190 Secure Email And Web Manager M195 Secure Email And Web Manager M380 Secure Email And Web Manager M390 Secure Email And Web Manager M390x Secure Email And Web Manager M395 Secure Email And Web Manager M680 Secure Email And Web Manager M690 Secure Email And Web Manager M690x Secure Email And Web Manager M695 Secure Email And Web Manager Virtual Appliance M100v Secure Email And Web Manager Virtual Appliance M300v Secure Email And Web Manager Virtual Appliance M600v Secure Email Gateway Secure Email Gateway C195 Secure Email Gateway C395 Secure Email Gateway C695 Secure Email Gateway Virtual Appliance C100v Secure Email Gateway Virtual Appliance C300v Secure Email Gateway Virtual Appliance C600v

Weaknesses