What’s Vulnerable › Vulnerabilities

CVE-2019-12581

• Severity: medium (CVSS 6.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 6.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-06-27 · updated 2026-06-17
• Weakness: CWE-79

Description

A reflective Cross-site scripting (XSS) vulnerability in the free_time_failed.cgi CGI program in selected Zyxel ZyWall, USG, and UAG devices allows remote attackers to inject arbitrary web script or HTML via the err_msg parameter.

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 4.30
• Zyxel Usg110 Firmware: through 4.30
• Zyxel Usg1900 Firmware: through 4.30
• Zyxel Usg210 Firmware: through 4.30
• Zyxel Usg2200-Vpn Firmware: through 4.30
• Zyxel Usg310 Firmware: through 4.30

References

• https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/
• https://sec-consult.com/en/blog/advisories/reflected-cross-site-scripting-in-zxel-zywall/index.html
• https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtml
• https://www.zyxel.com/us/en/
• https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/
• https://sec-consult.com/en/blog/advisories/reflected-cross-site-scripting-in-zxel-zywall/index.html
• https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtml
• https://www.zyxel.com/us/en/

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