Which products and versions are affected by CVE-2021-33558?

Affected: Boa versions 0.94.13. The full list is in the CVE brief.

Is CVE-2021-33558 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Feb 14, 2023 and is known to be used in ransomware campaigns.

Is CVE-2021-33558 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2021-33558?

No public exploit code is known.

Is there a fix for CVE-2021-33558?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2021-33558 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2021-33558

HighExploited

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.

Published May 27, 2021 · Updated Nov 21, 2024

Key Facts

Patch immediately

CVE-2021-33558 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Boa.
It is exploited in the wild, listed in Industry KEV feed since Feb 14, 2023 and is known to be used in ransomware campaigns. No public exploit code is known.
EPSS estimates a 12% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS (30-day exploit likelihood)

12%

Higher than 96.1% of all scored CVEs

Exploited in the wild

Yes

1 catalog listing, used by ransomware

Public exploit code

None known

Get the full CVE-2021-33558 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Feb 14, 2023	n/a	Known

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
BoaBoa	0.94.13	n/a

Timeline

Publicly disclosed
May 27, 2021
Added to Industry KEV feed
Feb 14, 2023
Last updated
Nov 21, 2024

References

FAQ

Common Questions.

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.
Affected: Boa versions 0.94.13. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Feb 14, 2023 and is known to be used in ransomware campaigns.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2021-33558 Running On Your Attack Surface?

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