HOMEVULNERABILITIESCVE-2019-9811
HIGH

CVE-2019-9811

CWE-74Published: July 23, 2019· Updated: Jun 17, 2026

8.3
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2019-9811 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.3.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionRequired
ScopeChanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
Mozilla3 product(s)
firefoxfirefox esrthunderbird
novell1 product(s)
suse package hub for suse linux enterprise
openSUSE1 product(s)
leap
Source: NVD CPE · 7 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

All References (30)

Quick Facts

CVE IDCVE-2019-9811
CVSS Score8.3 / 10
SeverityHIGH
WeaknessCWE-74
CISA KEVNo
Affected4 vendor(s)
PublishedJul 23, 2019

Related CVEs (CWE-74)

Recommended Actions

  • Apply vendor patches immediately
  • Monitor CVE-2019-9811 in threat intel feeds
  • Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.