CVE-2022-30526

Name: CVE-2022-30526
Creator: NVD / NIST
Published: 2022-07-19T06:15:08.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.12%

Last modified Jun 17, 2026

CVE-2022-30526 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A privilege escalation vulnerability was identified in the CLI command of Zyxel USG FLEX 100(W) firmware versions 4.50 through 5.30, USG FLEX 200 firmware versions 4.50 through 5.30, USG FLEX 500 firmware versions 4.50 through 5.30, USG FLEX 700 firmware versions 4.50 through 5.30, USG FLEX 50(W) firmware versions 4.16 through 5.30, USG20(W)-VPN firmware versions 4.16 through 5.30, ATP series firmware versions 4.32 through 5.30, VPN series firmware versions 4.30 through 5.30, USG/ZyWALL series firmware versions 4.09 through 4.72, which could allow a local attacker to execute some OS commands with root privileges in some directories on a vulnerable device.. EPSS estimates a 1.12% chance of exploitation in the next 30 days.

Description

A privilege escalation vulnerability was identified in the CLI command of Zyxel USG FLEX 100(W) firmware versions 4.50 through 5.30, USG FLEX 200 firmware versions 4.50 through 5.30, USG FLEX 500 firmware versions 4.50 through 5.30, USG FLEX 700 firmware versions 4.50 through 5.30, USG FLEX 50(W) firmware versions 4.16 through 5.30, USG20(W)-VPN firmware versions 4.16 through 5.30, ATP series firmware versions 4.32 through 5.30, VPN series firmware versions 4.30 through 5.30, USG/ZyWALL series firmware versions 4.09 through 4.72, which could allow a local attacker to execute some OS commands with root privileges in some directories on a vulnerable device.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

1.12%

61.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zyxel	Usg Flex 100w Firmware	>= 4.50, <= 5.30
Zyxel	Usg Flex 200 Firmware	>= 4.50, <= 5.30
Zyxel	Usg Flex 500 Firmware	>= 4.50, <= 5.30
Zyxel	Usg Flex 700 Firmware	>= 4.50, <= 5.30
Zyxel	Usg Flex 50w Firmware	>= 4.16, <= 5.30
Zyxel	Usg20w-Vpn Firmware	>= 4.16, <= 5.30
Zyxel	Atp800 Firmware	>= 4.32, <= 5.30
Zyxel	Atp700 Firmware	>= 4.32, <= 5.30
Zyxel	Atp500 Firmware	>= 4.32, <= 5.30
Zyxel	Atp200 Firmware	>= 4.32, <= 5.30
Zyxel	Atp100w Firmware	>= 4.32, <= 5.30
Zyxel	Atp100 Firmware	>= 4.32, <= 5.30
Zyxel	Vpn1000 Firmware	>= 4.30, <= 5.30
Zyxel	Vpn300 Firmware	>= 4.30, <= 5.30
Zyxel	Vpn100 Firmware	>= 4.30, <= 5.30
Zyxel	Vpn50 Firmware	>= 4.30, <= 5.30
Zyxel	Usg20-Vpn Firmware	>= 4.30, <= 5.30
Zyxel	Usg 2200-Vpn Firmware	>= 4.30, <= 5.30
Zyxel	Zywall 110 Firmware	>= 4.30, <= 5.30
Zyxel	Zywall 310 Firmware	>= 4.30, <= 5.30
Zyxel	Zywall 1100 Firmware	>= 4.30, <= 5.30
Zyxel	Usg40 Firmware	>= 4.09, <= 4.72
Zyxel	Usg40w Firmware	>= 4.09, <= 4.72
Zyxel	Usg60 Firmware	>= 4.09, <= 4.72
Zyxel	Usg60w Firmware	>= 4.09, <= 4.72

References

http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
https://www.zyxel.com/support/Zyxel-security-advisory-authenticated-directory-traversal-vulnerabilities-of-firewalls.shtmlVendor Advisory
http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
https://www.zyxel.com/support/Zyxel-security-advisory-authenticated-directory-traversal-vulnerabilities-of-firewalls.shtmlVendor Advisory

Timeline

Published: Jul 19, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-30526?

How severe is CVE-2022-30526?

CVE-2022-30526 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.12% probability of exploitation in the next 30 days.

How do I fix CVE-2022-30526?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-30526?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST