CVE-2022-34747CWE-134

A format string vulnerability in Zyxel NAS326 firmware versions prior to V5.21(AAZF.12)C0 could allow an attacker to achieve unauthorized remote code execution…

Critical · published September 6, 2022

CVSS v3.1
9.8
EPSS
2%
Percentile
77.6
In the wild
Unconfirmed
What it is

🔥 A single crafted UDP packet can unleash chaos! This format string vulnerability in Zyxel NAS326 firmware versions before V5.21(AAZF.12)C0 opens up the possibility for remote code execution. ⚡ Think of it like sending a package to a hotel that opens its door without checking who’s at the front desk. If you slip in a note with commands instead of a reservation, you could control the entire place from your couch! An attacker could remotely execute code on the device, allowing them to steal sensitive data, manipulate files, or even take complete control of the NAS storage. This could lead to devastating breaches of privacy and security in your network!

Put simply

Think of it like sending a package to a hotel that opens its door without checking who’s at the front desk. If you slip in a note with commands instead of a reservation, you could control the entire place from your couch! This vulnerability allows attackers to exploit the format string weaknesses in the Zyxel NAS326 firmware by sending specially crafted UDP packets, enabling unauthorized remote code execution.

What to do

An attacker could remotely execute code on the device, allowing them to steal sensitive data, manipulate files, or even take complete control of the NAS storage. This could lead to devastating breaches of privacy and security in your network! Immediately patch your Zyxel NAS326 firmware to version V5.21(AAZF.12)C0 or later. Additionally, review your network firewall settings to mitigate exposure to unsolicited UDP traffic. Don't forget to monitor for any suspicious activity! You've got this! Follow these steps and you'll secure your system in no time. 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01743 · 77.6th percentile
Weakness
CWE-134 · Use of Externally-Controlled Format String
Published
2022-09-06T01:20Z
EPSS history
Timeline
  • 06 SEP 01:20Z
    A format string vulnerability in Zyxel NAS326 firmware versions prior to V5.21(AAZF.12)C0 could allow an attacker to achieve unauthorized remote code execution…
    cvelistv5