CVE-2021-33558
Boa
- Published
- 27 May 2021
- Last modified
- 17 June 2026
- CVSS
- 7.5 v3.1
- Severity
- high
- EPSS
- 12.3% (96th pct)
- CISA KEV
- Not listed
- NVD status
- Modified
- Weaknesses
- None assigned
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Description
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.
Exploitation
Not listed in the CISA Known Exploited Vulnerabilities catalogue as of 2026.09.04. That is an absence of confirmed public exploitation, not evidence that exploitation has not occurred. EPSS models a 12.3% probability of exploitation activity in the next 30 days, placing it in the top decile of all scored CVEs.
Affected products
| Product | Vendor | Type | Versions named |
|---|---|---|---|
| Boa | Boa | unknown | 0.92r, 0.94.13, 0.94.14, 0.94.14.21 +2 |
References
- https://github.com/mdanzaruddin/CVE-2021-33558. exploit
- https://github.com/mdanzaruddin/CVE-2021-33558./issues/1 third-party
- https://sourceforge.net/projects/boa/files/boa/0.94.13/ third-party
- https://github.com/mdanzaruddin/CVE-2021-33558. exploit
- https://github.com/mdanzaruddin/CVE-2021-33558./issues/1 third-party
- https://sourceforge.net/projects/boa/files/boa/0.94.13/ third-party
Record assembled from NVD, CISA KEV 2026.09.04 and FIRST EPSS 2026-09-04. Affected products are those NVD's CPE configuration names that fall inside this site's scope; a CVE may affect products outside it.