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Vulnerability details: VCID-u8ss-4w7w-xyhy
Vulnerability ID VCID-u8ss-4w7w-xyhy
Aliases CVE-2020-12417
Summary Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in memory corruption and a potentially exploitable crash.*Note: this issue only affects Firefox on ARM64 platforms.*
Status Published
Exploitability 0.5
Weighted Severity 8.4
Risk 4.2
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-787 Out-of-bounds Write
CWE-617 Reachable Assertion
CWE-681 Incorrect Conversion between Numeric Types
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12417.json
epss 0.00651 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00651 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00651 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00651 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00651 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
epss 0.00757 https://api.first.org/data/v1/epss?cve=CVE-2020-12417
cvssv2 9.3 https://nvd.nist.gov/vuln/detail/CVE-2020-12417
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2020-12417
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-24
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-25
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-26
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-29
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00023.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00026.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00027.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00049.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12417.json
https://api.first.org/data/v1/epss?cve=CVE-2020-12417
https://bugzilla.mozilla.org/show_bug.cgi?id=1640737
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12417
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12418
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12419
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12420
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12421
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15646
https://security.gentoo.org/glsa/202007-09
https://security.gentoo.org/glsa/202007-10
https://www.mozilla.org/security/advisories/mfsa2020-24/
https://www.mozilla.org/security/advisories/mfsa2020-25/
https://www.mozilla.org/security/advisories/mfsa2020-26/
1853014 https://bugzilla.redhat.com/show_bug.cgi?id=1853014
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:*:*:*
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
CVE-2020-12417 https://nvd.nist.gov/vuln/detail/CVE-2020-12417
mfsa2020-24 https://www.mozilla.org/en-US/security/advisories/mfsa2020-24
mfsa2020-25 https://www.mozilla.org/en-US/security/advisories/mfsa2020-25
mfsa2020-26 https://www.mozilla.org/en-US/security/advisories/mfsa2020-26
mfsa2020-29 https://www.mozilla.org/en-US/security/advisories/mfsa2020-29
RHSA-2020:2825 https://access.redhat.com/errata/RHSA-2020:2825
RHSA-2020:2826 https://access.redhat.com/errata/RHSA-2020:2826
RHSA-2020:2827 https://access.redhat.com/errata/RHSA-2020:2827
RHSA-2020:2828 https://access.redhat.com/errata/RHSA-2020:2828
RHSA-2020:2906 https://access.redhat.com/errata/RHSA-2020:2906
RHSA-2020:2907 https://access.redhat.com/errata/RHSA-2020:2907
RHSA-2020:3038 https://access.redhat.com/errata/RHSA-2020:3038
RHSA-2020:3046 https://access.redhat.com/errata/RHSA-2020:3046
USN-4408-1 https://usn.ubuntu.com/4408-1/
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-2020-12417.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: AV:N/AC:M/Au:N/C:C/I:C/A:C Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12417
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-2020-12417
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 0.69856
EPSS Score 0.00651
Published At Aug. 12, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:40.753190+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-25.yml 37.0.0