Your Asus Wi-Fi router may have been hacked, according to a new blog post from the cybersecurity firm GreyNoise. As of Tuesday, over 9,000 Asus routers have been confirmed compromised in what the firm characterizes as an “ongoing exploitation campaign.

According to cybersecurity company GreyNoise, attackers used brute-force login attempts to break into thousands of Asus routers. If your router was made by Asus, read on to learn whether yours might have been compromised.

Users relying on Asus routers may still be exposed to a stealth backdoor campaign, even after updating firmware.