CVE-2018-5243: Symantec Encryption Management Server

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

The Symantec Encryption Management Server (SEMS) product, prior to version 3.4.2 MP1, may be susceptible to a denial of service (DoS) exploit. A DoS attack is a type of attack whereby the perpetrator attempts to make a particular machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a specific host within a network.

Affected products

• Symantec Encryption Management Server: up to and including 3.4.2

Published 2018-08-20. Last modified 2026-06-17.