CVE-2021-47726CWE-522

NuCom 11N Wireless Router 5.07.90 Privilege Escalation via Configuration Backup

High · published December 31, 2025

CVSS v4.0
8.7
EPSS
0%
Percentile
21.9
In the wild
Unconfirmed
What it is

⚡ A simple HTTP GET request can turn non-privileged users into admin powerhouses! 💥 With NuCom 11N Wireless Router 5.07.90, an attacker just needs a crafted request to snag the admin credentials from the backup configuration page! Think of this vulnerability like a delivery driver who accidentally hands over the master key to the entire building instead of just leaving the package at the door. Once they have that key, they can access any room, snooping around without anyone being the wiser! If exploited, this privilege escalation vulnerability could allow a malicious actor to waltz into the admin’s shoes, accessing sensitive configurations and controls. Imagine the chaos if unauthorized users gain control over your network settings, leading to data breaches or unauthorized access to critical information!

Put simply

Think of this vulnerability like a delivery driver who accidentally hands over the master key to the entire building instead of just leaving the package at the door. Once they have that key, they can access any room, snooping around without anyone being the wiser! This vulnerability in the NuCom 11N Wireless Router allows attackers to retrieve the administrator password by sending a specifically crafted HTTP GET request to the backup configuration endpoint, leveraging a vulnerable cookie to decode the password stored in Base64 format.

What to do

If exploited, this privilege escalation vulnerability could allow a malicious actor to waltz into the admin’s shoes, accessing sensitive configurations and controls. Imagine the chaos if unauthorized users gain control over your network settings, leading to data breaches or unauthorized access to critical information! To safeguard your network, patch the router to the latest firmware version as soon as possible. Additionally, consider disabling the configuration backup feature if it’s unnecessary, and regularly audit your device’s security settings to prevent unauthorized access. 🔒 You've got this! By taking these steps, you'll reinforce your defenses and keep your network safe! 🛡️

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00303 · 21.9th percentile
Weakness
CWE-522 · Insufficiently Protected Credentials
Published
2025-12-31T18:39Z
EPSS history
Timeline
  • 31 DEC 18:39Z
    NuCom 11N Wireless Router 5.07.90 Privilege Escalation via Configuration Backup
    cvelistv5