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CVE-2021-3811

22
FAUCET Score

CVE-2021-3811 describes a Cross-Site Scripting (XSS) vulnerability (CWE-79) in the AdminLTE web interface, specifically impacting Pi-hole installations. This medium-severity vulnerability, rated 6.1 CVSSv3.1, allows an unauthenticated attacker to inject malicious scripts via network access, requiring user interaction for successful exploitation, potentially leading to limited impact on confidentiality and integrity. There is currently no evidence of active exploitation, no known public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.6CPE matchmatch criteria
cpe:2.3:a:pi-hole:web_interface:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.7MEDIUM

CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.55%
Probability of exploitation in next 30 days
EPSS Percentile
42.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0055 is in the 45th percentile among its peer group of 26,221 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / pi-hole/adminlte/commit/f526716de7bb0fd382a64bcbbb33915c926f94bb
PatchThird Party Advisory
huntr.dev / bounties/fa38c61f-4043-4872-bc85-7fe5ae5cc2e8
ExploitIssue TrackingPatchThird Party Advisory