CVE-2004-0307: Cisco Optical Networking Systems Software

Medium severity, CVSS 5.0. EPSS: 1.6% chance of exploitation in the next 30 days.

Cisco ONS 15327 before 4.1(3), ONS 15454 before 4.6(1), and ONS 15454 SD before 4.1(3) allows remote attackers to cause a denial of service (reset) by not sending the ACK portion of the TCP three-way handshake and sending an invalid response instead.

Affected products

• Cisco Optical Networking Systems Software: version 1.0 only; version 4.0(1) only; version 4.0(2) only; version 4.0.0 only; version 4.1(0) only; version 4.1(1) only; …

Published 2004-11-23. Last modified 2026-06-16.