CVE-2021-4459
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-08-27

Last updated on: 2025-08-29

Assigner: CERT VDE

Description
An authorized remote attacker can access files and directories outside the intended web root, potentially exposing sensitive system information of the affected Sunny Boy devices.
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Meta Information
Published
2025-08-27
Last Modified
2025-08-29
Generated
2026-06-16
AI Q&A
2025-08-27
EPSS Evaluated
2026-06-14
NVD
CVE-2021-4459
EUVD
EUVD-2021-34684
Affected Vendors & Products
Showing 5 associated CPEs
Vendor Product Version / Range
sma_solar_technology_ag sunny_boy 4.0
sma_solar_technology_ag sunny_boy 3.0
sma_solar_technology_ag sunny_boy 3.6
sma_solar_technology_ag sunny_boy 5.0
sma_solar_technology_ag sunny_boy 6.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-23 The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.
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Executive Summary

CVE-2021-4459 is a Directory Traversal vulnerability affecting SMA Solar Technology AG's Sunny Boy devices (versions 3.0, 3.6, 4.0, 5.0, and 6.0 prior to firmware 3.10.27.R). It allows an authenticated remote attacker to access files and directories outside the intended web root, potentially exposing sensitive system information. [1]

Impact Analysis

This vulnerability can impact you by allowing an authenticated remote attacker to access sensitive system information stored outside the intended web root on affected Sunny Boy devices. This exposure could lead to information disclosure without affecting system integrity or availability. [1]

Mitigation Strategies

The immediate step to mitigate this vulnerability is to update affected Sunny Boy devices to firmware version 3.10.27.R or later, as this version contains the fix for the directory traversal vulnerability. [1]

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