Patched - Zyxel Nr7103

The unpatched versions of the NR7103 (specifically those prior to V1.00(ABUV.3)C0) suffered from two main flaws:

If your router is unpatched, stop reading and do this immediately. The process takes less than 10 minutes. zyxel nr7103 patched

You might think, "My NR7103 is outdoors, behind NAT, and only accessible via VPN." Unfortunately, these vulnerabilities undermine that logic in three ways: The unpatched versions of the NR7103 (specifically those

The underlying Linux toolkit (BusyBox) and encryption libraries (OpenSSL) have been updated to versions that fix known CVEs like CVE-2022-30065 (a denial-of-service flaw in awk) and old TLS vulnerabilities. Between May and July 2024, a Mirai-based botnet

Between May and July 2024, a Mirai-based botnet (dubbed "RapperBot") actively scanned for unpatched Zyxel NR7103 and similar devices. Researchers at Unit 42 noted that the botnet specifically targeted the command injection flaw to download a DDoS payload.

One telecom provider in Scandinavia reported that over 1,200 unpatched NR7103 units were compromised in a single weekend. These routers were then used to attack a major gaming platform. The only way to reclaim the devices was to physically disconnect them, reflash the firmware via serial console, and apply the patch.

The takeaway: If your NR7103 is unpatched, it is not a matter of if you will be hacked, but when. Automated scanners are relentless.