What is CVE-2020-6803?

CVE-2020-6803 is a medium-severity vulnerability in Mozilla Webthings Gateway, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.4/10. Published 2020-02-28.

How severe is CVE-2020-6803?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Open Redirect in Mozilla Webthings Gateway

CVE-2020-6803

An open redirect is present on the gateway's login page, which could cause a user to be redirected to a malicious site after logging in.

Vulnerability class: Open Redirect

Published 2020-02-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Mozilla Webthings Gateway — versions 0.3.0, 0.12.0
Mozilla Webthings Gateway

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

github.com/mozilla-iot/gateway/pull/2446 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-6803?: CVE-2020-6803 is a medium-severity vulnerability in Mozilla Webthings Gateway, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.4/10. Published 2020-02-28.
How severe is CVE-2020-6803?: Medium severity. CVSS v3 base score is 5.4 out of 10.