CVE-2019-9800

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

Description

Mozilla developers and community members reported memory safety bugs present in Firefox 66, Firefox ESR 60.6, and Thunderbird 60.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.

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-2019-9800

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2019-9800.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201905-8

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201905-9

OS impact

OSVersionStatusFixed in
arch archfixed67.0-1
suse slesaffected
debian debiansidfixed67.0-2
debian debianbookwormfixed60.7.0esr-1
debian debianbullseyefixed60.7.0esr-1
debian debianforkyfixed60.7.0esr-1
debian debiantrixiefixed60.7.0esr-1

References

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