What is CVE-2023-32209?

CVE-2023-32209 is a high-severity vulnerability in Mozilla Firefox, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2023-06-19.

How severe is CVE-2023-32209?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Mozilla Firefox

CVE-2023-32209

A maliciously crafted favicon could have led to an out of memory crash. This vulnerability affects Firefox < 113.

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (53.9th percentile), scored 2026-10-08.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Mozilla Firefox — versions unspecified

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
security.gentoo.org/glsa/202401-10
www.mozilla.org/security/advisories/mfsa2023-16/ (Vendor Advisory)

Frequently asked questions

What is CVE-2023-32209?: CVE-2023-32209 is a high-severity vulnerability in Mozilla Firefox, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2023-06-19.
How severe is CVE-2023-32209?: High severity. CVSS v3 base score is 7.5 out of 10.