What is CVE-2019-3997?

CVE-2019-3997 is a medium-severity vulnerability in Simplisafe Ss3, classified under Improper Authentication. CVSS score: 4.6/10. Published 2020-01-16.

How severe is CVE-2019-3997?

Medium severity. CVSS v3 base score is 4.6 out of 10.

Auth bypass in Simplisafe Ss3

CVE-2019-3997

Authentication bypass using an alternate path or channel in SimpliSafe SS3 firmware 1.0-1.3 allows a local, unauthenticated attacker to pair a rogue keypad to an armed system.

Vulnerability class: Broken Authentication

Published 2020-01-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (30.6th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.6% 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

Simplisafe Ss3
Simplisafe Ss3 Firmware
Simplisafe Ss3 — versions 1.0-1.3

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

www.tenable.com/security/research/tra-2020-03 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-3997?: CVE-2019-3997 is a medium-severity vulnerability in Simplisafe Ss3, classified under Improper Authentication. CVSS score: 4.6/10. Published 2020-01-16.
How severe is CVE-2019-3997?: Medium severity. CVSS v3 base score is 4.6 out of 10.