CVE-2019-9811

HIGH
8.3
CVSS Score
Published: July 23, 2019 at 01:26 PM UTC
Updated: June 17, 2026 at 02:44 AM UTC
6 products affected across 4 vendorsDebian LinuxFirefoxThunderbird

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Severity
HIGH8.3
Exploit prediction
EPSS 3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 68
Affected range stops below 68, so it looks safe — our inference, not a vendor statement
Affected range stops below 68.0, so it looks safe — our inference, not a vendor statement
v < 60.8
Affected range stops below 60.8, so it looks safe — our inference, not a vendor statement
v < 60.8
Affected range stops below 60.8, so it looks safe — our inference, not a vendor statement

References (15)

x_refsource_MISCIssue TrackingPermissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1538007
x_refsource_MISCExploitIssue TrackingPatchVendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1539598
x_refsource_MISCExploitIssue TrackingVendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1563327

CVSS

Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-74

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