01 Record

CVE-2022-30525

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

CriticalKEVPUBLISHEDCNA: Zyxel

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

View raw JSON

02 Description

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

03 Exploitation and scoring

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2022-05-16. Federal remediation due 2022-06-06.

SSVC decision

ExploitationactiveCISA reports credible evidence of active exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

99.94% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 99.9% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2022-05-12 13:05Z4 YR AGO

Last updated

2025-10-21 23:15Z1 YR AGO

Reserved

2022-05-10

Assigning CNA

Zyxel

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')Base

Data version

5.1

Document digest

510b2b108b8a2949b8eccc515c2d4a6bd10bbc9e47c547d13d200ae8da8a8e40

05 Affected products

VendorProductVersionsPlatforms

ZyxelUSG FLEX 100(W) firmware5.00 through 5.21 Patch 1—

ZyxelUSG FLEX 200 firmware5.00 through 5.21 Patch 1—

ZyxelUSG FLEX 500 firmware5.00 through 5.21 Patch 1—

ZyxelUSG FLEX 700 firmware5.00 through 5.21 Patch 1—

ZyxelATP series firmware5.10 through 5.21 Patch 1—

ZyxelVPN series firmware4.60 through 5.21 Patch 1—

ZyxelUSG FLEX 50(W) firmware5.10 through 5.21 Patch 1—

ZyxelUSG 20(W)-VPN firmware5.10 through 5.21 Patch 1—

06 References

www.zyxel.comhttps://www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.shtmlx_refsource_CONFIRM
packetstormsecurity.comhttp://packetstormsecurity.com/files/167176/Zyxel-Remote-Command-Execution.htmlx_refsource_MISC
packetstormsecurity.comhttp://packetstormsecurity.com/files/167182/Zyxel-Firewall-ZTP-Unauthenticated-Command-Injection.htmlx_refsource_MISC
packetstormsecurity.comhttp://packetstormsecurity.com/files/167372/Zyxel-USG-FLEX-5.21-Command-Injection.htmlx_refsource_MISC
packetstormsecurity.comhttp://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.htmlx_refsource_MISC
www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-30525government-resource