CVE-2025-20393: Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability

Analysis on rafaelpfister.ch

Article · October 6, 2026 CVE-2026-76461: Cisco Secure Email Gateway SQL Injection Is Being Exploited—Update and Check for Compromise A specially crafted email is all it takes: via an SQL injection in AsyncOS, attackers can execute commands with root privileges on Cisco Secure Email Gateway (CVE-2026-76461, CVSS 9.8). The vulnerability is being exploited, and no workaround is available. Updating to a fixed version and checking for compromise are required.

Vendor 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.

Reference data

Vendor

Cisco

Affected products

Cisco Secure Email
Cisco Secure Email and Web Manager

CVSS 3.1

10.0 (CRITICAL)

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness type

CWE-20: Improper Input Validation

Published

December 17, 2025

In KEV catalog since

December 17, 2025

US federal deadline

December 24, 2025

Official sources

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