CVE-2025-20393—Cisco Multiple Products Improper Input Validation Vulnerability

Vulnerability Name

Cisco Multiple Products Improper Input Validation Vulnerability

Description

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.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

Unknown

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.

Additional 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

Related News Articles

• Cisco Fixes Actively Exploited Zero-Day CVE-2026-20045 in Unified CM and WebexJanuary 22, 2026
• Cisco finally fixes AsyncOS zero-day exploited since NovemberJanuary 16, 2026
• Cisco Patches Zero-Day RCE Exploited by China-Linked APT in Secure Email GatewaysJanuary 16, 2026
• Cisco warns of Identity Service Engine flaw with exploit codeJanuary 8, 2026
• Cisco Warns of Active Attacks Exploiting Unpatched 0-Day in AsyncOS Email Security AppliancesDecember 18, 2025

Related Weaknesses

• CWE-20