SMA: Directory Traversal in Sunny Boy <3.10.27.R
Priority LOW 30CWE-23Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-23 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00671 52nd percentileScored 2026-11-07
Fix Fixed Boy 3.0 (SMA): 3.10.27.RBoy 3.6 (SMA): 3.10.27.R+3 more products
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| SMA | Boy 3.0 | 0.0.0 to before 3.10.27.R | 3.10.27.R | Patch available | CNA |
| SMA | Boy 3.6 | 0.0.0 to before 3.10.27.R | 3.10.27.R | Patch available | CNA |
| SMA | Boy 4.0 | 0.0.0 to before 3.10.27.R | 3.10.27.R | Patch available | CNA |
| SMA | Boy 5.0 | 0.0.0 to before 3.10.27.R | 3.10.27.R | Patch available | CNA |
| SMA | Boy 6.0 | 0.0.0 to before 3.10.27.R | 3.10.27.R | Patch available | CNA |
- Boy 3.0 VendorSMA Affected 0.0.0 to before 3.10.27.R Fixed in 3.10.27.R Patch available CNA
- Boy 3.6 VendorSMA Affected 0.0.0 to before 3.10.27.R Fixed in 3.10.27.R Patch available CNA
- Boy 4.0 VendorSMA Affected 0.0.0 to before 3.10.27.R Fixed in 3.10.27.R Patch available CNA
- Boy 5.0 VendorSMA Affected 0.0.0 to before 3.10.27.R Fixed in 3.10.27.R Patch available CNA
- Boy 6.0 VendorSMA Affected 0.0.0 to before 3.10.27.R Fixed in 3.10.27.R Patch available CNA
Remediation
- Fix · CNA Boy 3.0 (SMA) Fixed in 3.10.27.R
- Fix · CNA Boy 3.6 (SMA) Fixed in 3.10.27.R
- Fix · CNA Boy 4.0 (SMA) Fixed in 3.10.27.R
- Fix · CNA Boy 5.0 (SMA) Fixed in 3.10.27.R
- Fix · CNA Boy 6.0 (SMA) Fixed in 3.10.27.R
Timeline
- 2026-10-02 Threatist record created from CVE-2021-4459
- 2026-10-03 Alias added: GHSA-qm93-m2hc-9vjf
References
More SMA vulnerabilities
- TI-2019-10161 Cross-site request forgery in SMA Solar Technology AG Sunny WebBox CVSS 3.1HIGH 8.8
- TI-2021-21218 Insecure direct object reference in SUNNY TRIPOWER 5.0 Firmware version 3.10.16.R leads… CVSS 3.1HIGH 8.1
- TI-2017-07230 An issue was discovered in SMA Solar Technology products. CVSS 3.0CRITICAL 9.8
- TI-2017-07225 An issue was discovered in SMA Solar Technology products. CVSS 3.1CRITICAL 9.8
- TI-2017-07231 An issue was discovered in SMA Solar Technology products. CVSS 3.0CRITICAL 9.8
- TI-2017-07223 An issue was discovered in SMA Solar Technology products. CVSS 3.0CRITICAL 9.8
Sources
- CVE-2021-4459 · CVE Program
- CVE-2021-4459 · NVD
- FIRST EPSS
- GHSA-qm93-m2hc-9vjf · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences