CVE-2017-9855

9.8 criticalEPSS 1.6%

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

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 1.6% chance of exploitation in the next 30 days; higher than 75% of CVEs (scores of 2026-10-31)
CWE: CWE-863
Published: 2017-08-05
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

sma:sunny_boy_1.5_firmware
sma:sunny_boy_2.5_firmware
sma:sunny_boy_3.0_firmware
sma:sunny_boy_3.6_firmware
sma:sunny_boy_3000tl_firmware
sma:sunny_boy_3600_firmware
sma:sunny_boy_3600tl_firmware
sma:sunny_boy_4.0_firmware
sma:sunny_boy_4000tl_firmware
sma:sunny_boy_5.0_firmware
sma:sunny_boy_5000_firmware
sma:sunny_boy_5000tl_firmware
sma:sunny_boy_storage_2.5_firmware
sma:sunny_central_1000cp_xt_firmware
sma:sunny_central_2200_firmware
sma:sunny_central_500cp_xt_firmware
sma:sunny_central_630cp_xt_firmware
sma:sunny_central_720cp_xt_firmware
sma:sunny_central_760cp_xt_firmware
sma:sunny_central_800cp_xt_firmware
sma:sunny_central_850cp_xt_firmware
sma:sunny_central_900cp_xt_firmware
sma:sunny_central_storage_1000_firmware
sma:sunny_central_storage_2200_firmware
sma:sunny_central_storage_2500-ev_firmware
sma:sunny_central_storage_500_firmware
sma:sunny_central_storage_630_firmware
sma:sunny_central_storage_720_firmware
sma:sunny_central_storage_760_firmware
sma:sunny_central_storage_800_firmware
sma:sunny_central_storage_850_firmware
sma:sunny_central_storage_900_firmware
sma:sunny_tripower_12000tl_firmware
sma:sunny_tripower_15000tl_firmware
sma:sunny_tripower_20000tl_firmware
sma:sunny_tripower_25000tl_firmware
sma:sunny_tripower_5000tl_firmware
sma:sunny_tripower_60_firmware
sma:sunny_tripower_core1_firmware

References

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