What is CVE-2023-6870?

CVE-2023-6870 is a medium-severity vulnerability in Google Android. CVSS score: 4.3/10. Published 2023-12-19.

How severe is CVE-2023-6870?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Google Android

CVE-2023-6870

Applications which spawn a Toast notification in a background thread may have obscured fullscreen notifications displayed by Firefox. *This issue only affects Android versions of Firefox and Firefox Focus.* This vulnerability affects Firefox < 121.

Published 2023-12-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (30.0th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.0% 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

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
www.mozilla.org/security/advisories/mfsa2023-56/ (Vendor Advisory)
security.gentoo.org/glsa/202401-10 (Third Party Advisory)

Frequently asked questions

What is CVE-2023-6870?: CVE-2023-6870 is a medium-severity vulnerability in Google Android. CVSS score: 4.3/10. Published 2023-12-19.
How severe is CVE-2023-6870?: Medium severity. CVSS v3 base score is 4.3 out of 10.