CISA KEV · Known exploitedCritical

CVE-2022-30525

Zyxel Multiple Firewalls

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 exe...

CVSS: 9.8
EPSS: 99.9%
CISA KEV: Listed
Published: 2022.05.12

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability99.9%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Zyxel Multiple Firewalls
Affected versions: 5.00 through 5.21 Patch 1, 5.10 through 5.21 Patch 1, 4.60 through 5.21 Patch 1, >= 5.00 < 5.30, >= 5.00 <= 5.30, >= 4.60 < 5.30, >= 5.10 < 5.30
Fixed versions: 5.30

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2022.06.06

1
Identify
Confirm that Zyxel Multiple Firewalls and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-78
KEV added: 2022.05.16
Ransomware use: 미확인