CVE-2019-9811

Name: CVE-2019-9811
Creator: NVD / NIST
Published: 2019-07-23T14:15:16.903+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.3/10EPSS 2.57%

Last modified Jun 17, 2026

CVE-2019-9811 is a high-severity vulnerability rated 8.3/10 on the CVSS scale. 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.. EPSS estimates a 2.57% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.3/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS Probability

2.57%

83.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 68.0
Mozilla	Firefox Esr	< 60.8
Mozilla	Thunderbird	< 60.8
Debian	Debian Linux	8.0
Novell	Suse Package Hub For Suse Linux Enterprise	12
Opensuse	Leap	15.0
Opensuse	Leap	15.1

References

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00055.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00058.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00073.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.htmlThird Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1538007Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1539598Exploit, Issue Tracking, Patch, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1563327Exploit, Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00001.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00002.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/201908-12Third Party Advisory
https://security.gentoo.org/glsa/201908-20Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-21/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-22/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-23/Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00055.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00058.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00073.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.htmlThird Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1538007Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1539598Exploit, Issue Tracking, Patch, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1563327Exploit, Issue Tracking, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00001.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00002.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/201908-12Third Party Advisory
https://security.gentoo.org/glsa/201908-20Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-21/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-22/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-23/Vendor Advisory

Timeline

Published: Jul 23, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-9811?

How severe is CVE-2019-9811?

CVE-2019-9811 has a CVSS score of 8.3/10 (HIGH severity). The EPSS model estimates a 2.57% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9811?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-9811?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST