CVE-2021-23995
high
CVSS v3
—
CVSS v2
—
VIR risk
8.0
Description
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.
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-23995
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-23995.html
Vendor advisory: arch — https://security.archlinux.org/ASA-202104-3
Vendor advisory: arch — https://security.archlinux.org/ASA-202104-4
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 78.10.0-1 | |
| sles | affected | | |
| debian | sid | fixed | 88.0-1 |
| debian | bookworm | fixed | 78.10.0esr-1 |
| debian | bullseye | fixed | 78.10.0esr-1 |
| debian | forky | fixed | 78.10.0esr-1 |
| debian | trixie | fixed | 78.10.0esr-1 |
References
Verify integrity in audit chain (admin only). AS-IS.