CVE-2017-9855

CRITICAL
9.8
CVSS Score
Published: August 5, 2017 at 05:00 PM UTC
Updated: June 17, 2026 at 01:29 AM UTC
78 products affected across 1 vendorSunny Central 760CP Xt FirmwareSunny Central 800CP Xt FirmwareSunny Boy 4.0 Firmware

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Severity
CRITICAL9.8
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
sma-sunny-boy-2-5 (same device)
All versions
sma-sunny-boy-3000tl (same device)
All versions
sma-sunny-boy-3600 (same device)
All versions
sma-sunny-boy-3600tl (same device)
All versions
sma-sunny-boy-4000tl (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfoCWE-863

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