CVE-2018-12242: The Symantec Messaging Gateway product prior to 10.6.6 may be susceptible to an authentication bypass explo...

Security readout for executives and security teams

CVE-2018-12242 is an authentication bypass issue in Symantec Messaging Gateway before 10.6.6. In business terms, a vulnerable mail security gateway may allow an attacker to get around normal access controls. The public bundle does not provide CVSS, exploit details, or confirmed active exploitation. Exposure is limited to organizations running Symantec Messaging Gateway before 10.6.6. Risk is more concerning where the product or administrative interfaces are reachable from untrusted networks, but the provided sources do not define the exact reachable surface. Prioritize this for any environment still using Symantec Messaging Gateway below 10.6.6. The issue affects authentication controls, but urgency should be driven by deployment exposure because the sources do not confirm active exploitation or severity scoring. Mitigation focus: Identify all Symantec Messaging Gateway deployments and their versions.; Upgrade affected systems out of the prior-to-10.6.6 range.; Review the Symantec advisory for vendor-specific remediation guidance..

Prepared

Jun 7, 2026, 05:35 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.