CVE-2021-20783: Softbank Optical Bb Unit E-Wmta Firmware

High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days.

Cross-site request forgery (CSRF) vulnerability in Optical BB unit E-WMTA2.3 allows a remote attacker to hijack the authentication of administrators via a specially crafted page.

Affected products

• Softbank Optical Bb Unit E-Wmta Firmware: version 2.3 only

Published 2021-07-30. Last modified 2026-06-17.