CVE-2019-9812

CRITICAL

9.3

CVSS Score

Published: January 8, 2020 at 09:41 PM UTC

Updated: June 17, 2026 at 02:44 AM UTC

2 products affected across 1 vendorFirefoxFirefox ESR

Using Firefox ESR by Mozilla?

Get instant alerts when new vulnerabilities affect Firefox ESR - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

CRITICAL9.3

Exploit prediction

EPSS 2%

Description

Given a compromised sandboxed content process due to a separate vulnerability, it is possible to escape that sandbox by loading accounts.firefox.com in that process and forcing a log-in to a malicious Firefox Sync account. Preference settings that disable the sandbox are then synchronized to the local machine and the compromised browser would restart without the sandbox if a crash is triggered. This vulnerability affects Firefox ESR < 60.9, Firefox ESR < 68.1, and Firefox < 69.

Affected

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

Firefox · Mozilla

95%

v < 60.9v < 69v < 69.061.0 ≤ v < 68.1

Affected range stops below 68.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 69, so it looks safe — our inference, not a vendor statement

Affected range stops below 69.0, so it looks safe — our inference, not a vendor statement

Firefox ESR · Mozilla

60%

v < 68.1

Affected range stops below 60.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 68.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

x_refsource_CONFIRMPermissions Required

Source: [email protected]

https://bugzilla.mozilla.org/show_bug.cgi?id=1538008

x_refsource_MISCPermissions Required

Source: [email protected]

https://bugzilla.mozilla.org/show_bug.cgi?id=1538015

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2019-25/

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2019-26/

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2019-27/

CVSS

9.3CRITICAL[email protected]

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

Vector?

Quick Info

StatusMODIFIED

CWE

NVD-CWE-noinfo

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card