CVE-1999-1540: Cactus Software Shell-Lock

Low severity, CVSS 2.1. EPSS: 0.3% chance of exploitation in the next 30 days.

shell-lock in Cactus Software Shell Lock uses weak encryption (trivial encoding) which allows attackers to easily decrypt and obtain the source code.

Affected products

• Cactus Software Shell-Lock: any version

Published 1999-10-04. Last modified 2026-06-16.