Skip to main content
No exploitation reportedFix available

CVE-2019-9811

No exploitation reported by the sources we read.

  • Published2019-07-23
  • WeaknessCWE-74

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2019-07-2314:15CVE publishedNVD

Versions per branch

NVD
Opensuse leap
BranchAffectedFixed in
15.0= 15.0no fix published
15.1= 15.1no fix published
Debian debian linux
BranchAffectedFixed in
8.0= 8.0no fix published
Mozilla firefox
BranchAffectedFixed in
68.0< 68.068.0

3 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxUbuntu:18.04:LTSall versions · fixed in 68.0+build3-0ubuntu0.18.04.1
  • firefoxUbuntu:16.04:LTSall versions · fixed in 68.0+build3-0ubuntu0.16.04.1
  • firefoxRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:60.8.0-1.el8_0and 5 other packages
  • firefoxRed Hat:enterprise_linux:7::workstationall versions · fixed in 0:60.8.0-1.el7_6and 3 other packages
  • firefoxRed Hat:enterprise_linux:7::serverall versions · fixed in 0:60.8.0-1.el7_6and 3 other packages
  • firefoxRed Hat:enterprise_linux:7::clientall versions · fixed in 0:60.8.0-1.el7_6and 3 other packages
  • firefoxRed Hat:enterprise_linux:6::workstationall versions · fixed in 0:60.8.0-1.el6_10and 3 other packages
  • firefoxRed Hat:enterprise_linux:6::serverall versions · fixed in 0:60.8.0-1.el6_10and 3 other packages

155 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-9811 Red Hat Product Security113 products fixed · 1 known affected

    Mozilla: Sandbox escape via installation of malicious language pack

    firefox.src as a component of Red Hat Enterprise Linux 5

  • RHSA-2019:1799 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: thunderbird security and bug fix update

  • RHSA-2019:1777 Red Hat Product Security19 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2019:1775 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2019:1763 Red Hat Product Security28 products fixed

    Red Hat Security Advisory: firefox security update

  • RHSA-2019:1765 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: firefox security update

1 more advisory

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2019:1799 · 7 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
  2. Vendor fix Red Hat Product Security RHSA-2019:1763 · 28 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect.
  3. No fix planned, says the vendor Red Hat Product Security CVE-2019-9811 · 1 productOut of support scope

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Published
2019-07-23
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-63j5-535g-4392

Frequently asked questions

What is CVE-2019-9811?

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.

Is CVE-2019-9811 actively exploited?

Active exploitation of CVE-2019-9811 has not been confirmed. Its EPSS score was 2.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-9811?

CVE-2019-9811 has a CVSS v3 base score of 8.3 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

Running Mozilla? Hear about its next vulnerability

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record