CVE-2017-9855: SMA Sunny Boy 1.5 Firmware

Critical severity, CVSS 9.8. EPSS: 1.6% chance of exploitation in the next 30 days.

An issue was discovered in SMA Solar Technology products. A secondary authentication system is available for Installers called the Grid Guard system. This system uses predictable codes, and a single Grid Guard code can be used on any SMA inverter. Any such code, when combined with the installer account, allows changing very sensitive parameters. NOTE: the vendor reports that Grid Guard is not an authentication feature; it is only a tracing feature. Also, only Sunny Boy TLST-21 and TL-21 and Sunny Tripower TL-10 and TL-30 could potentially be affected

Affected products

• SMA Sunny Boy 1.5 Firmware: affected versions not specified
• SMA Sunny Boy 2.5 Firmware: affected versions not specified
• SMA Sunny Boy 3.0 Firmware: affected versions not specified
• SMA Sunny Boy 3.6 Firmware: affected versions not specified
• SMA Sunny Boy 3000tl Firmware: affected versions not specified
• SMA Sunny Boy 3600 Firmware: affected versions not specified
• SMA Sunny Boy 3600tl Firmware: affected versions not specified
• SMA Sunny Boy 4.0 Firmware: affected versions not specified
• SMA Sunny Boy 4000tl Firmware: affected versions not specified
• SMA Sunny Boy 5.0 Firmware: affected versions not specified
• SMA Sunny Boy 5000 Firmware: affected versions not specified
• SMA Sunny Boy 5000tl Firmware: affected versions not specified
• SMA Sunny Boy Storage 2.5 Firmware: affected versions not specified
• SMA Sunny Central 1000cp Xt Firmware: affected versions not specified
• SMA Sunny Central 2200 Firmware: affected versions not specified
• SMA Sunny Central 500cp Xt Firmware: affected versions not specified
• SMA Sunny Central 630cp Xt Firmware: affected versions not specified
• SMA Sunny Central 720cp Xt Firmware: affected versions not specified
• SMA Sunny Central 760cp Xt Firmware: affected versions not specified
• SMA Sunny Central 800cp Xt Firmware: affected versions not specified
• SMA Sunny Central 850cp Xt Firmware: affected versions not specified
• SMA Sunny Central 900cp Xt Firmware: affected versions not specified
• SMA Sunny Central Storage 1000 Firmware: affected versions not specified
• SMA Sunny Central Storage 2200 Firmware: affected versions not specified
• SMA Sunny Central Storage 2500-Ev Firmware: affected versions not specified
• and 14 more

Published 2017-08-05. Last modified 2026-06-17.