Vulnerability in Mozilla Firefox

CVE-2021-43537

An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

EPSS: 0.020 (78.9th 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

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-43537?
CVE-2021-43537 is a high-severity vulnerability in Mozilla Firefox, classified under Incorrect Type Conversion or Cast. CVSS score: 8.8/10. Published 2021-12-08.
How severe is CVE-2021-43537?
High severity. CVSS v3 base score is 8.8 out of 10.