What is CVE-2021-23997?

CVE-2021-23997 is a high-severity vulnerability in Mozilla Firefox, classified under Incorrect Conversion between Numeric Types. CVSS score: 8.8/10. Published 2021-06-24.

How severe is CVE-2021-23997?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Mozilla Firefox

CVE-2021-23997

Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the font cache. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox…

EPSS: 0.008 (53.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Mozilla Firefox — versions unspecified

Weakness classification (CWE)

CWE-681 — Incorrect Conversion between Numeric Types

References

security@mozilla.org (x_refsource_MISC, Release Notes, Vendor Advisory)
security@mozilla.org (Permissions Required, x_refsource_MISC, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2021-23997?: CVE-2021-23997 is a high-severity vulnerability in Mozilla Firefox, classified under Incorrect Conversion between Numeric Types. CVSS score: 8.8/10. Published 2021-06-24.
How severe is CVE-2021-23997?: High severity. CVSS v3 base score is 8.8 out of 10.