What is CVE-2021-3812?

CVE-2021-3812 is a medium-severity vulnerability in Pi-Hole Pi-Hole/adminlte, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-09-17.

How severe is CVE-2021-3812?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Pi-Hole Pi-Hole/adminlte

CVE-2021-3812

adminlte is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-09-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (44.8th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Pi-Hole Pi-Hole/adminlte — versions unspecified
Pi-Hole Web Interface

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/pi-hole/adminlte/commit/f526716de7bb0fd382a64bcbbb33915c926f94bb (Patch, Third Party Advisory)
huntr.dev/bounties/875a6885-9a64-46f3-94ad-92f40f989200 (Exploit, Patch, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-3812?: CVE-2021-3812 is a medium-severity vulnerability in Pi-Hole Pi-Hole/adminlte, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-09-17.
How severe is CVE-2021-3812?: Medium severity. CVSS v3 base score is 6.1 out of 10.