CVE-2021-33558: Boa

High severity, CVSS 7.5. EPSS: 12.3% chance of exploitation in the next 30 days.

Boa 0.94.13 allows remote attackers to obtain sensitive information via a misconfiguration involving backup.html, preview.html, js/log.js, log.html, email.html, online-users.html, and config.js. NOTE: multiple third parties report that this is a site-specific issue because those files are not part of Boa.

Affected products

• Boa Boa: version 0.94.13 only

Published 2021-05-27. Last modified 2026-06-17.