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Fencer Vulns
critical 9.8

CVE-2017-9855 json

An issue was discovered in SMA Solar Technology products.

published 2017-08-05 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-18765

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

1.58% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • sma sunny_boy_3600_firmware
  • sma sunny_boy_5000_firmware
  • sma sunny_tripower_core1_firmware
  • sma sunny_tripower_15000tl_firmware
  • sma sunny_tripower_20000tl_firmware
  • sma sunny_tripower_25000tl_firmware
  • sma sunny_tripower_5000tl_firmware
  • sma sunny_tripower_12000tl_firmware
  • sma sunny_tripower_60_firmware
  • sma sunny_boy_3000tl_firmware
  • sma sunny_boy_3600tl_firmware
  • sma sunny_boy_4000tl_firmware
  • sma sunny_boy_5000tl_firmware
  • 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_4.0_firmware
  • sma sunny_boy_5.0_firmware
  • sma sunny_central_2200_firmware
  • sma sunny_central_1000cp_xt_firmware
  • sma sunny_central_800cp_xt_firmware
  • sma sunny_central_850cp_xt_firmware
  • sma sunny_central_900cp_xt_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_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_central_storage_1000_firmware
  • sma sunny_central_storage_2200_firmware
  • sma sunny_central_storage_2500-ev_firmware
  • sma sunny_boy_storage_2.5_firmware

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.