CVE-2022-30526 — A privilege escalation vulnerability was identified in the CLI command of Zyxel

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 5.3

01What is this vulnerability?

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…

02Affected products

Vendor	Product	Versions
Zyxel	USG FLEX 100(W) firmware	4.50 through 5.30
Zyxel	USG FLEX 200 firmware	4.50 through 5.30
Zyxel	USG FLEX 500 firmware	4.50 through 5.30
Zyxel	USG FLEX 700 firmware	4.50 through 5.30
Zyxel	ATP series firmware	4.32 through 5.30
Zyxel	VPN series firmware	4.30 through 5.30
Zyxel	USG FLEX 50(W) firmware	4.16 through 5.30
Zyxel	USG 20(W)	VPN firmware — 4.16 through 5.30
Zyxel	USG/ZyWALL series firmware	4.09 through 4.72

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-07-19T05:45:14.000Z
• Last modified: 2024-08-03T06:48:36.418Z

09References

• www.zyxel.com — https://www.zyxel.com/support/Zyxel-security-advisory-authenticated-directory-tr…
• packetstormsecurity.com — http://packetstormsecurity.com/files/168202/Zyxel-Firewall-SUID-Binary-Privilege…