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. It has a CVSS v3.1 base score of 10.0 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

CVE-2025-20393 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

CVE-2025-20393 affects products from cisco, specifically: asyncos, 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_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. Check the affected products table above for specific version ranges.

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.