CVE-2021-21876: Lantronix Premierwave 2050 Firmware

Critical severity, CVSS 9.1. EPSS: 2.7% chance of exploitation in the next 30 days.

Specially-crafted HTTP requests can lead to arbitrary command execution in PUT requests. An attacker can make authenticated HTTP requests to trigger this vulnerability.

Affected products

• Lantronix Premierwave 2050 Firmware: version 8.9.0.0 only

Published 2021-12-22. Last modified 2026-06-17.