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Vulnerability details: VCID-pred-sx6g-aaad
Vulnerability ID VCID-pred-sx6g-aaad
Aliases CVE-2020-12421
Summary When performing add-on updates, certificate chains terminating in non-built-in-roots were rejected (even if they were legitimately added by an administrator.) This could have caused add-ons to become out-of-date silently without notification to the user. This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-295 Improper Certificate Validation
CWE-296 Improper Following of a Certificate's Chain of Trust
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-12421.html
rhas Important https://access.redhat.com/errata/RHSA-2020:2824
rhas Important https://access.redhat.com/errata/RHSA-2020:2825
rhas Important https://access.redhat.com/errata/RHSA-2020:2826
rhas Important https://access.redhat.com/errata/RHSA-2020:2827
rhas Important https://access.redhat.com/errata/RHSA-2020:2828
rhas Important https://access.redhat.com/errata/RHSA-2020:2906
rhas Important https://access.redhat.com/errata/RHSA-2020:2907
rhas Important https://access.redhat.com/errata/RHSA-2020:2966
rhas Important https://access.redhat.com/errata/RHSA-2020:3038
rhas Important https://access.redhat.com/errata/RHSA-2020:3046
cvssv3 6.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12421.json
epss 0.00463 https://api.first.org/data/v1/epss?cve=CVE-2020-12421
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epss 0.00977 https://api.first.org/data/v1/epss?cve=CVE-2020-12421
epss 0.01004 https://api.first.org/data/v1/epss?cve=CVE-2020-12421
epss 0.01004 https://api.first.org/data/v1/epss?cve=CVE-2020-12421
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epss 0.01622 https://api.first.org/data/v1/epss?cve=CVE-2020-12421
rhbs medium https://bugzilla.redhat.com/show_bug.cgi?id=1853018
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12417
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12418
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12419
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12420
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12421
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15646
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-12421
cvssv3 6.5 https://nvd.nist.gov/vuln/detail/CVE-2020-12421
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2020-12421
generic_textual Medium https://ubuntu.com/security/notices/USN-4408-1
generic_textual Medium https://ubuntu.com/security/notices/USN-4421-1
generic_textual Medium https://usn.ubuntu.com/usn/usn-4408-1
generic_textual Medium https://usn.ubuntu.com/usn/usn-4421-1
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-24
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2020-24/#CVE-2020-12421
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-25
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2020-25/#CVE-2020-12421
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
http://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-12421.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12421.json
https://api.first.org/data/v1/epss?cve=CVE-2020-12421
https://bugzilla.mozilla.org/show_bug.cgi?id=1308251
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://ubuntu.com/security/notices/USN-4408-1
https://ubuntu.com/security/notices/USN-4421-1
https://usn.ubuntu.com/4421-1/
https://usn.ubuntu.com/usn/usn-4408-1
https://usn.ubuntu.com/usn/usn-4421-1
https://www.mozilla.org/en-US/security/advisories/mfsa2020-24/#CVE-2020-12421
https://www.mozilla.org/en-US/security/advisories/mfsa2020-25/#CVE-2020-12421
https://www.mozilla.org/security/advisories/mfsa2020-24/
https://www.mozilla.org/security/advisories/mfsa2020-25/
https://www.mozilla.org/security/advisories/mfsa2020-26/
1853018 https://bugzilla.redhat.com/show_bug.cgi?id=1853018
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-2020-12421 https://nvd.nist.gov/vuln/detail/CVE-2020-12421
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-2020:2824 https://access.redhat.com/errata/RHSA-2020:2824
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-2020:2966 https://access.redhat.com/errata/RHSA-2020:2966
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/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12421.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:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12421
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:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12421
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:L/PR:N/UI:R/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12421
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 0.75155
EPSS Score 0.00463
Published At Dec. 17, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.