CVE-2004-1436: Cisco Optical Networking Systems Software

High severity, CVSS 7.5. EPSS: 3.1% chance of exploitation in the next 30 days.

The Transaction Language 1 (TL1) login interface in Cisco ONS 15327 4.6(0) and 4.6(1) and 15454 and 15454 SDH 4.6(0) and 4.6(1), when a user account is configured with a blank password, allows remote attackers to gain unauthorized access by logging in with a password larger than 10 characters.

Affected products

• Cisco Optical Networking Systems Software: version 1.0 only; version 1.1 only; version 1.1(0) only; version 1.1(1) only; version 1.3(0) only; version 2.3(5) only; …

Published 2004-12-31. Last modified 2026-06-16.