What is CVE-2019-3998?

CVE-2019-3998 is a medium-severity vulnerability in Simplisafe Ss3, classified under Improper Authentication. CVSS score: 5.5/10. Published 2020-02-13.

How severe is CVE-2019-3998?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Auth bypass in Simplisafe Ss3

CVE-2019-3998

Authentication bypass using an alternate path or channel in SimpliSafe SS3 firmware 1.4 allows a local, unauthenticated attacker to modify the Wi-Fi network the base station connects to.

Vulnerability class: Broken Authentication

Published 2020-02-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (27.7th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.7% 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 — versions 1.4
Simplisafe Ss3 Base Station — versions 1.4

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

www.tenable.com/security/research/tra-2020-09 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-3998?: CVE-2019-3998 is a medium-severity vulnerability in Simplisafe Ss3, classified under Improper Authentication. CVSS score: 5.5/10. Published 2020-02-13.
How severe is CVE-2019-3998?: Medium severity. CVSS v3 base score is 5.5 out of 10.