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Vulnerability details: VCID-yybf-7qmk-2ba3
Vulnerability ID VCID-yybf-7qmk-2ba3
Aliases CVE-2019-9812
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-250 Execution with Unnecessary Privileges
System Score Found at
cvssv3 9.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9812.json
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
epss 0.0052 https://api.first.org/data/v1/epss?cve=CVE-2019-9812
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 5.8 https://nvd.nist.gov/vuln/detail/CVE-2019-9812
cvssv3.1 9.3 https://nvd.nist.gov/vuln/detail/CVE-2019-9812
archlinux High https://security.archlinux.org/AVG-1036
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-25
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-26
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2019-27
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9812.json
https://api.first.org/data/v1/epss?cve=CVE-2019-9812
https://bugzilla.mozilla.org/show_bug.cgi?id=1538008
https://bugzilla.mozilla.org/show_bug.cgi?id=1538015
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11740
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11742
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11743
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11744
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11746
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11752
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9812
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2019-25/
https://www.mozilla.org/security/advisories/mfsa2019-26/
https://www.mozilla.org/security/advisories/mfsa2019-27/
1748660 https://bugzilla.redhat.com/show_bug.cgi?id=1748660
ASA-201909-2 https://security.archlinux.org/ASA-201909-2
AVG-1036 https://security.archlinux.org/AVG-1036
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
CVE-2019-9812 https://nvd.nist.gov/vuln/detail/CVE-2019-9812
mfsa2019-25 https://www.mozilla.org/en-US/security/advisories/mfsa2019-25
mfsa2019-26 https://www.mozilla.org/en-US/security/advisories/mfsa2019-26
mfsa2019-27 https://www.mozilla.org/en-US/security/advisories/mfsa2019-27
RHSA-2019:2663 https://access.redhat.com/errata/RHSA-2019:2663
RHSA-2019:2694 https://access.redhat.com/errata/RHSA-2019:2694
RHSA-2019:2729 https://access.redhat.com/errata/RHSA-2019:2729
USN-4122-1 https://usn.ubuntu.com/4122-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9812.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2019-9812
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-9812
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.65841
EPSS Score 0.0052
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:58.098244+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2019/mfsa2019-27.yml 37.0.0