CVE-2026-2548 WAYOS FBM-220G rc sub_40F820 command injection
Remote attackers can execute arbitrary commands on WAYOS FBM-220G devices via manipulated UPnP arguments in the rc script.
- 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-2026-2548?
CVE-2026-2548 is a medium-severity command injection vulnerability in WAYOS FBM-220G, published on 16 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw has been found in WAYOS FBM-220G 24.10.19. This affects the function sub_40F820 of the file rc. Executing a manipulation of the argument upnp_waniface/upnp_ssdp_interval/upnp_max_age can lead to command injection. The attack can be executed remotely. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-2548?
How do I fix CVE-2026-2548?
No fix has been published for CVE-2026-2548 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-2548 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2548 exists.
Sources
Also known as GHSA-vfjw-j4jg-frr6.