CVE-2020-6814

critical
Published — · Modified —
CVSS v3
CVSS v2
VIR risk
9.5

Description

Mozilla developers reported memory safety bugs present in Firefox and Thunderbird 68.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

Predictions

Exploit likelihood
20%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2020-6814

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2020-6814.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-202003-8

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-202003-11

OS impact

OSVersionStatusFixed in
arch archfixed68.6.0-1
suse slesaffected
debian debiansidfixed74.0-1
debian debianbookwormfixed68.6.0esr-1
debian debianbullseyefixed68.6.0esr-1
debian debianforkyfixed68.6.0esr-1
debian debiantrixiefixed68.6.0esr-1

References

Verify integrity in audit chain (admin only). AS-IS.