CVE-2026-21639 Command injection in airFiber AF60
A remote attacker in Wi-Fi range can execute arbitrary code on Ubiquiti airMAX and airFiber devices via a vulnerability in the wireless protocol.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21639?
CVE-2026-21639 is a high-severity command injection vulnerability in Ubiquiti Inc airFiber AF60, published on 8 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A malicious actor in Wi-Fi range of the affected product could leverage a vulnerability in the airMAX Wireless Protocol to achieve a remote code execution (RCE) within the affected product.
Which versions are affected by CVE-2026-21639?
It affects 4 products.
Products include Ui Airfiber Af60-Xg Firmware, Ui Airfiber Af60 Firmware, Ui Airmax Ac Firmware, Ui Airmax M Firmware.
How do I fix CVE-2026-21639?
No fix has been published for CVE-2026-21639 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-2026-21639 being exploited?
There is no known exploitation of CVE-2026-21639 in the wild and no public exploit code.
Sources
Also known as GHSA-9vw7-2gjw-jc6x.