CVE-2015-2055: Zhone Technologies GPON 2520 Firmware

High severity, CVSS 7.8. EPSS: 3% chance of exploitation in the next 30 days.

Zhone GPON 2520 with firmware R4.0.2.566b allows remote attackers to cause a denial of service via a long string in the oldpassword parameter.

Affected products

• Zhone Technologies GPON 2520 Firmware: version r4.0.2.566b only

Published 2015-02-23. Last modified 2026-06-17.