cve.bz

CVE-2021-23995

8.8 highEPSS 1.2%

High (8.8) in mozilla. EPSS 1.2% chance of exploitation in the next 30 days.

When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

Severity

CVSS 3.1

8.8 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
1.2% chance of exploitation in the next 30 days; higher than 67% of CVEs (scores of 2026-10-31)
CWE
CWE-672
Published
Modified
Record from
the NVD, synced

Affected

References

Check your stackJSON