CVE-2020-16134: Swisscom Internet-Box 2 Firmware

High severity, CVSS 8.0. EPSS: 0.8% chance of exploitation in the next 30 days.

An issue was discovered on Swisscom Internet Box 2, Internet Box Standard, Internet Box Plus prior to 10.04.38, Internet Box 3 prior to 11.01.20, and Internet Box light prior to 08.06.06. Given the (user-configurable) credentials for the local Web interface or physical access to a device's plus or reset button, an attacker can create a user with elevated privileges on the Sysbus-API. This can then be used to modify local or remote SSH access, thus allowing a login session as the superuser.

Affected products

• Swisscom Internet-Box 2 Firmware: before 10.04.38 (fixed in 10.04.38)
• Swisscom Internet-Box 3 Firmware: before 11.01.20 (fixed in 11.01.20)
• Swisscom Internet-Box Light Firmware: before 08.06.06 (fixed in 08.06.06)
• Swisscom Internet-Box Plus Firmware: before 10.04.38 (fixed in 10.04.38)
• Swisscom Internet-Box Standard Firmware: before 10.04.38 (fixed in 10.04.38)

Published 2020-08-04. Last modified 2026-06-17.