What is CVE-2020-8157?

CVE-2020-8157 is a medium-severity vulnerability in Ui Unifi Cloud Key Gen2, classified under Improper Access Control. CVSS score: 6.8/10. Published 2020-05-02.

How severe is CVE-2020-8157?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Ui Unifi Cloud Key Gen2

CVE-2020-8157

UniFi Cloud Key firmware <= v1.1.10 for Cloud Key gen2 and Cloud Key gen2 Plus contains a vulnerability that allows unrestricted root access through the serial interface (UART).

Published 2020-05-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (26.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Ui Unifi Cloud Key Gen2
Ui Unifi Cloud Key Gen2 Firmware
Ui Unifi Cloud Key Gen2 Plus
Ui Unifi Cloud Key Gen2 Plus Firmware
Unifi Cloud Key Gen2, Gen2 Plus — versions Fixed in v1.1.11

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

community.ui.com/releases/Security-advisory-bulletin-008-008/5f66ca4c-10d6-4ca5… (Vendor Advisory)
community.ui.com/releases/UniFi-Cloud-Key-Firmware-1-1-11/a24e55e1-6d90-46d7-92… (Vendor Advisory)

Frequently asked questions

What is CVE-2020-8157?: CVE-2020-8157 is a medium-severity vulnerability in Ui Unifi Cloud Key Gen2, classified under Improper Access Control. CVSS score: 6.8/10. Published 2020-05-02.
How severe is CVE-2020-8157?: Medium severity. CVSS v3 base score is 6.8 out of 10.