Medium severity · published Aug 27, 2025
CVE-2021-4459
SMA: Directory Traversal in Sunny Boy <3.10.27.R
6.5
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
B3
Boy 3.0 · SMA
0.0.0 before 3.10.27.R · source: vendor
B3
Boy 3.6 · SMA
0.0.0 before 3.10.27.R · source: vendor
B4
Boy 4.0 · SMA
0.0.0 before 3.10.27.R · source: vendor
B5
Boy 5.0 · SMA
0.0.0 before 3.10.27.R · source: vendor
B6
Boy 6.0 · SMA
0.0.0 before 3.10.27.R · source: vendor