CVE-2021-33903: Lancom-Systems Lcos

High severity, CVSS 8.8. EPSS: 1.1% chance of exploitation in the next 30 days.

In LCOS 10.40 to 10.42.0473-RU3 with SNMPv3 enabled on LANCOM devices, changing the password of the root user via the CLI does not change the password of the root user for SNMPv3 access. (However, changing the password of the root user via LANconfig does change the password of the root user for SNMPv3 access.)

Affected products

• Lancom-Systems Lcos: from 10.40, before 10.42.0473 (fixed in 10.42.0473); version 10.42.0473 only

Published 2021-10-07. Last modified 2026-06-17.