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Vulnerability record · CVE-2019-12583 · published 27 June 2019

CVE-2019-12583: Zyxel uag2100 firmware vulnerability

Zyxel · Uag2100 Firmware

Missing Access Control in the "Free Time" component of several Zyxel UAG, USG, and ZyWall devices allows a remote attacker to generate guest accounts by directly accessing the account generator. This can lead to unauthorised network access or Denial of Service.

9.1 CVSS 3.0 Critical EPSS 44% · top 1.3% CWE-425 · CWE-425
9.1CVSS 3.0 base score, v2 6.4
44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
14Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Missing Access Control in the "Free Time" component of several Zyxel UAG, USG, and ZyWall devices allows a remote attacker to generate guest accounts by directly accessing the account generator. This can lead to unauthorised network access or Denial of Service.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

14 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/ ExploitThird Party Advisory
https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtml PatchVendor Advisory
https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/ ExploitThird Party Advisory
https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtml PatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-12583), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.