What is CVE-2021-22957?

CVE-2021-22957 is a high-severity vulnerability in Ui Unifi Protect, classified under CWE-16. CVSS score: 8.8/10. Published 2021-11-24.

How severe is CVE-2021-22957?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Ui Unifi Protect

CVE-2021-22957

A Cross-Origin Resource Sharing (CORS) vulnerability found in UniFi Protect application Version 1.19.2 and earlier allows a malicious actor who has convinced a privileged user to access a URL with malicious code to take over said user’s account.This vulnerability is fixed in UniFi Protect application Version 1.20.0 and later.

Published 2021-11-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: +0.000

Affected products

Ui Unifi Protect
Unifi Protect Application — versions Fixed in 1.20.0

Weakness classification (CWE)

CWE-16

References

community.ui.com/releases/Security-Advisory-Bulletin-021-021/62bd8841-6603-4fee… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-22957?: CVE-2021-22957 is a high-severity vulnerability in Ui Unifi Protect, classified under CWE-16. CVSS score: 8.8/10. Published 2021-11-24.
How severe is CVE-2021-22957?: High severity. CVSS v3 base score is 8.8 out of 10.