CVE-2019-9812: mozilla firefox
Vulnerability summary
CVE-2019-9812 is a critical (CVSS 9.3) vulnerability in mozilla firefox. EPSS estimates a 1.51% chance of exploitation in the next 30 days, higher than 74% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 17 · Related 10Timeline
- 08-01-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.3CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.3CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H
EPSS trend
Probability
1.51%
Chance of exploitation in the next 30 days
Percentile
74%
Versus all other CVEs
30-day change
0.00 pp
From 1.51% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu3 products
- firefox< 69.0+build2-0ubuntu0.16.04.4 | < 69.0+build2-0ubuntu0.18.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
Mozilla2 products
- firefox< 69 | < 60.9 | < 69.0 | ≥ 61.0, < 68.1
- firefox_esr< 60.9 | < 68.1
Debian1 product
- firefox-esr< 68.1.0esr-1
3 vendors · 6 products
