CVE-1999-1100: Cisco Pix Private Link

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

Cisco PIX Private Link 4.1.6 and earlier does not properly process certain commands in the configuration file, which reduces the effective key length of the DES key to 48 bits instead of 56 bits, which makes it easier for an attacker to find the proper key via a brute force attack.

Affected products

• Cisco Pix Private Link: up to and including 4.1\(6\)

Published 1999-12-31. Last modified 2026-06-16.