What’s Vulnerable › Vulnerabilities

CVE-2019-12583

• Severity: critical (CVSS 9.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 43.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-06-27 · updated 2026-06-17
• Weakness: CWE-425

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.

Affected products

• Zyxel Uag2100 Firmware: through 4.18\(aaiz.1\)c0
• Zyxel Uag4100 Firmware: through 4.18\(aatd.1\)c0
• Zyxel Uag5100 Firmware: through 4.18\(aapn.1\)c0
• Zyxel Usg1100 Firmware: through 4.33\(aapk.0\)c0
• Zyxel Usg110 Firmware: through 4.33\(aaph.0\)c0
• Zyxel Usg1900 Firmware: through 4.33\(aapl.0\)c0
• Zyxel Usg210 Firmware: through 4.33\(aapi.0\)c0
• Zyxel Usg2200-Vpn Firmware: through 4.33\(abae.0\)c0
• Zyxel Usg310 Firmware: through 4.33\(aapj.0\)c0
• Zyxel Zywall 1100 Firmware: through 4.33\(aaac.0\)c0
• Zyxel Zywall 110 Firmware: through 4.33\(aaaa.0\)c0
• Zyxel Zywall 310 Firmware: through 4.33\(aaab.0\)c0
• Zyxel Zywall Vpn100 Firmware: through 10.02\(abfv.0\)c0
• Zyxel Zywall Vpn300 Firmware: through 10.02\(abfc.0\)c0

References

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

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