Security News > 2025 > January > Zyxel warns of bad signature update causing firewall boot loops
![Zyxel warns of bad signature update causing firewall boot loops](/static/build/img/news/zyxel-warns-of-bad-signature-update-causing-firewall-boot-loops-medium.jpg)
2025-01-24 20:39
Zyxel is warning that a bad security signature update is causing critical errors for USG FLEX or ATP Series firewalls, including putting the device into a boot loop. [...]