CVE-2026-76461 Cisco AsyncOS Software for Cisco Secure Email Gateway - Command Injection

Cisco AsyncOS Software for Cisco Secure Email Gateway contains a command injection caused by insufficient validation in email parsing logic, letting unauthenticated remote attackers execute arbitrary commands with root privileges, exploit requires sending crafted email messages.

CVSS base score 9.8 /10
Critical
CISA KEV
Exploited in the wild
Public exploit
Proof of concept available
Authentication
Not required
EPSS
29.54% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Command Injection
Impact
Remote Code Execution, Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-89

Vendor fix

Update to the latest available version of Cisco AsyncOS Software for Cisco Secure Email Gateway.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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