CVE-2022-30525
Published on May 12, 2022

A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21 Patch 1, USG FLEX 200 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 500 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 700 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 50(W) firmware versions 5.10 through 5.21 Patch 1, USG20(W)-VPN firmware versions 5.10 through 5.21 Patch 1, ATP series firmware versions 5.10 through 5.21 Patch 1, VPN series firmware versions 4.60 through 5.21 Patch 1, which could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.

NVD

Known Exploited Vulnerability

This Zyxel Multiple Firewalls OS Command Injection Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. A command injection vulnerability in the CGI program of some Zyxel firewall versions could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.

The following remediation steps are recommended / required by June 6, 2022: Apply updates per vendor instructions.

Vulnerability Analysis

CVE-2022-30525 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a Shell injection Vulnerability?

The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

CVE-2022-30525 has been classified to as a Shell injection vulnerability or weakness.


Affected Versions

Zyxel USG FLEX 100(W) firmware: Zyxel USG FLEX 200 firmware: Zyxel USG FLEX 500 firmware: Zyxel USG FLEX 700 firmware: Zyxel ATP series firmware: Zyxel VPN series firmware: Zyxel USG FLEX 50(W) firmware: Zyxel USG 20(W)-VPN firmware:

Exploit Probability

EPSS
94.45%
Percentile
99.99%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.