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CVE-2022-30525

Zyxel — Zyxel Multiple Firewalls OS Command Injection Vulnerability

Zyxel · CWE-78 — Operating system command injection · in CISA KEV since 2022-05-16

ExigentKEV since 2022 · listed over a yearCISA KEVActively Exploited
87

EVRS 87 of 100 Immediate

Out-of-Band / Urgent Remediation

Rank 218 of 2,962 tracked

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Why it scores 87

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.999.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

usg flex 100w firmware: update to 5.30 or later | usg flex 200 firmware: update to 5.30 or later | usg flex 500 firmware: update to a version newer than 5.30 | usg flex 700 firmware: update to 5.30 or later | vpn100 firmware: update to 5.30 or later | vpn1000 firmware: update to 5.30 or later

Affected versions

  • usg flex 100w firmware>= 5.00 < 5.30
  • usg flex 200 firmware>= 5.00 < 5.30
  • usg flex 500 firmware>= 5.00 <= 5.30
  • usg flex 700 firmware>= 5.00 < 5.30
  • vpn100 firmware>= 4.60 < 5.30
  • vpn1000 firmware>= 4.60 < 5.30
  • vpn300 firmware>= 4.60 < 5.30
  • vpn50 firmware>= 4.60 < 5.30

+24 more affected products; see the full list at NVD.

Remediation

Apply updates per vendor instructions.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 9.8 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.999 (99.97th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2022-06-06 · KEV since 2022 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. Public module exists Metasploit
EUVD cross-referenceENISA's record: CVSS 9.8 (v3.1), assigned by Zyxel. Listed ENISA EUVD

Description

NVD

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.

What CISA says to do

Public module

Metasploit lists a public excellent-rank module for this CVE: Zyxel Firewall ZTP Unauthenticated Command Injection (linux/http/zyxel_ztp_rce). A module existing is not the same as active exploitation; see metasploit.com.