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Vulnerability details: VCID-4y3r-my3j-xbdr
Vulnerability ID VCID-4y3r-my3j-xbdr
Aliases CVE-2020-12406
Summary Mozilla developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code.
Status Published
Exploitability 0.5
Weighted Severity 8.4
Risk 4.2
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-345 Insufficient Verification of Data Authenticity
CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12406.json
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
epss 0.00342 https://api.first.org/data/v1/epss?cve=CVE-2020-12406
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 9.3 https://nvd.nist.gov/vuln/detail/CVE-2020-12406
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2020-12406
archlinux High https://security.archlinux.org/AVG-1173
archlinux High https://security.archlinux.org/AVG-1179
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-20
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-21
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-22
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12406.json
https://api.first.org/data/v1/epss?cve=CVE-2020-12406
https://bugzilla.mozilla.org/show_bug.cgi?id=1639590
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12398
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12399
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12405
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12406
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12410
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2020-20/
https://www.mozilla.org/security/advisories/mfsa2020-21/
https://www.mozilla.org/security/advisories/mfsa2020-22/
1843312 https://bugzilla.redhat.com/show_bug.cgi?id=1843312
ASA-202006-1 https://security.archlinux.org/ASA-202006-1
ASA-202006-4 https://security.archlinux.org/ASA-202006-4
AVG-1173 https://security.archlinux.org/AVG-1173
AVG-1179 https://security.archlinux.org/AVG-1179
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:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
CVE-2020-12406 https://nvd.nist.gov/vuln/detail/CVE-2020-12406
mfsa2020-20 https://www.mozilla.org/en-US/security/advisories/mfsa2020-20
mfsa2020-21 https://www.mozilla.org/en-US/security/advisories/mfsa2020-21
mfsa2020-22 https://www.mozilla.org/en-US/security/advisories/mfsa2020-22
RHSA-2020:2378 https://access.redhat.com/errata/RHSA-2020:2378
RHSA-2020:2379 https://access.redhat.com/errata/RHSA-2020:2379
RHSA-2020:2380 https://access.redhat.com/errata/RHSA-2020:2380
RHSA-2020:2381 https://access.redhat.com/errata/RHSA-2020:2381
RHSA-2020:2382 https://access.redhat.com/errata/RHSA-2020:2382
RHSA-2020:2611 https://access.redhat.com/errata/RHSA-2020:2611
RHSA-2020:2613 https://access.redhat.com/errata/RHSA-2020:2613
RHSA-2020:2614 https://access.redhat.com/errata/RHSA-2020:2614
RHSA-2020:2615 https://access.redhat.com/errata/RHSA-2020:2615
RHSA-2020:2616 https://access.redhat.com/errata/RHSA-2020:2616
USN-4383-1 https://usn.ubuntu.com/4383-1/
USN-4421-1 https://usn.ubuntu.com/4421-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12406.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:C/I:C/A:C Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12406
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:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12406
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 0.56179
EPSS Score 0.00342
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:38.807848+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-22.yml 37.0.0