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CVE-2021-33558

40
FAUCET Score

CVE-2021-33558 describes an information disclosure vulnerability in Boa 0.94.13, potentially allowing remote attackers to access sensitive data through misconfigured files like backup.html and config.js. This high-severity vulnerability (CVSS 7.5) has a low attack complexity and requires no user interaction, leading to a high impact on confidentiality. Although some reports suggest it's a site-specific issue rather than a core Boa vulnerability, its high EPSS score and FAUCET Risk Score of 99/100 indicate significant exploitability. While not in the KEV catalog, it has garnered substantial community discussion and media coverage, with reports of hackers targeting it in power grid attacks, and Nuclei templates are available for detection.

Impacted Technologies

VendorProductVersion(s)CPE
0.94.13CPE matchmatch criteria
cpe:2.3:a:boa:boa:0.94.13:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
12.31%
Probability of exploitation in next 30 days
EPSS Percentile
95.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2021-33558 · Jun 9, 2025
This CVE's current EPSS score of 0.1231 is in the 94th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

github.com / mdanzaruddin/CVE-2021-33558.
ExploitThird Party Advisory
github.com / mdanzaruddin/CVE-2021-33558./issues/1
Issue TrackingThird Party Advisory
sourceforge.net / projects/boa/files/boa/0.94.13
Release NotesThird Party Advisory