CVE-2021-33558
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 12.3%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 12.31% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- boa/boa
- Source
- cve@mitre.org
EPSS 12.3% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/mdanzaruddin/CVE-2021-33558.Exploit, Third Party Advisory
- https://github.com/mdanzaruddin/CVE-2021-33558./issues/1Issue Tracking, Third Party Advisory
- https://sourceforge.net/projects/boa/files/boa/0.94.13/Release Notes, Third Party Advisory
- https://github.com/mdanzaruddin/CVE-2021-33558.Exploit, Third Party Advisory
- https://github.com/mdanzaruddin/CVE-2021-33558./issues/1Issue Tracking, Third Party Advisory
- https://sourceforge.net/projects/boa/files/boa/0.94.13/Release Notes, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.