Zyxel’s “Oops, I Did It Again”: Privilege Escalation Vulnerability Strikes!
Discover the Zyxel USG FLEX H series privilege escalation exploit, which lets you leap from lowly user to system overlord with just a few symbolic link shenanigans. Perfect for those who enjoy turning temporary files into permanent headaches, this exploit could redefine your understanding of “root dance.”
Hot Take:
It’s 2025, and Zyxel routers are still making it super easy for hackers to dance their way into root access. While the rest of the tech world is dreaming of flying cars and holographic cats, Zyxel is apparently still stuck in the ‘how to not set a sticky bit’ era. If only their security was as futuristic as their marketing slogans. Maybe they should rename their routers to “The Bouncer” because they sure aren’t letting any security measures in.
Key Points:
- Zyxel’s USG FLEX H series routers are vulnerable to privilege escalation via a symbolic link exploit.
- The exploit leverages the lack of sticky bit on the /tmp directory to create arbitrary writable files.
- The vulnerability allows users to escalate privileges from a low-level user to root.
- The issue affects Zyxel uOS V1.31 on various FLEX H series models.
- CVE ID for this exploit is CVE-2025-1731 with a severity score of 7.8.