CVE-2019-9811

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

Description

As part of a winning Pwn2Own entry, a researcher demonstrated a sandbox escape by installing a malicious language pack and then opening a browser feature that used the compromised translation. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.

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-2019-9811

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2019-9811.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201907-4

OS impact

OSVersionStatusFixed in
arch archfixed68.0-1
suse slesaffected
debian debiansidfixed68.0-1
debian debianbookwormfixed60.8.0esr-1
debian debianbullseyefixed60.8.0esr-1
debian debianforkyfixed60.8.0esr-1
debian debiantrixiefixed60.8.0esr-1

References

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