CVE-2021-4459 SMA: Directory Traversal in Sunny Boy <3.10.27.R
An authorized remote attacker can access files outside the web root, exposing sensitive system information on SMA Sunny Boy devices.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-4459?
CVE-2021-4459 is a medium-severity path traversal vulnerability in SMA Boy 3.0, published on 27 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-23
Which versions are affected by CVE-2021-4459?
How do I fix CVE-2021-4459?
No fix has been published for CVE-2021-4459 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-4459 being exploited?
There is no known exploitation of CVE-2021-4459 in the wild and no public exploit code.
Sources
Also known as GHSA-qm93-m2hc-9vjf.