Search for vulnerabilities
Vulnerability details: VCID-ke6p-bsvh-73f2
Vulnerability ID VCID-ke6p-bsvh-73f2
Aliases CVE-2020-12395
Summary Mozilla developers and community members Alexandru Michis, Jason Kratzer, philipp, Ted Campbell, Bas Schouten, André Bargull, and Karl Tomlinson reported memory safety bugs present in Firefox 75 and Firefox ESR 68.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-787 Out-of-bounds Write
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12395.json
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
epss 0.01231 https://api.first.org/data/v1/epss?cve=CVE-2020-12395
cvssv2 10.0 https://nvd.nist.gov/vuln/detail/CVE-2020-12395
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2020-12395
archlinux Critical https://security.archlinux.org/AVG-1148
archlinux Critical https://security.archlinux.org/AVG-1155
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2020-16
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2020-17
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2020-18
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12395.json
https://api.first.org/data/v1/epss?cve=CVE-2020-12395
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1595886%2C1611482%2C1614704%2C1624098%2C1625749%2C1626382%2C1628076%2C1631508
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12387
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12392
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12395
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12397
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6831
https://security.gentoo.org/glsa/202005-03
https://security.gentoo.org/glsa/202005-04
https://www.mozilla.org/security/advisories/mfsa2020-16/
https://www.mozilla.org/security/advisories/mfsa2020-17/
https://www.mozilla.org/security/advisories/mfsa2020-18/
1831765 https://bugzilla.redhat.com/show_bug.cgi?id=1831765
ASA-202005-3 https://security.archlinux.org/ASA-202005-3
ASA-202005-7 https://security.archlinux.org/ASA-202005-7
AVG-1148 https://security.archlinux.org/AVG-1148
AVG-1155 https://security.archlinux.org/AVG-1155
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-2020-12395 https://nvd.nist.gov/vuln/detail/CVE-2020-12395
mfsa2020-16 https://www.mozilla.org/en-US/security/advisories/mfsa2020-16
mfsa2020-17 https://www.mozilla.org/en-US/security/advisories/mfsa2020-17
mfsa2020-18 https://www.mozilla.org/en-US/security/advisories/mfsa2020-18
RHSA-2020:2031 https://access.redhat.com/errata/RHSA-2020:2031
RHSA-2020:2032 https://access.redhat.com/errata/RHSA-2020:2032
RHSA-2020:2033 https://access.redhat.com/errata/RHSA-2020:2033
RHSA-2020:2036 https://access.redhat.com/errata/RHSA-2020:2036
RHSA-2020:2037 https://access.redhat.com/errata/RHSA-2020:2037
RHSA-2020:2046 https://access.redhat.com/errata/RHSA-2020:2046
RHSA-2020:2047 https://access.redhat.com/errata/RHSA-2020:2047
RHSA-2020:2048 https://access.redhat.com/errata/RHSA-2020:2048
RHSA-2020:2049 https://access.redhat.com/errata/RHSA-2020:2049
RHSA-2020:2050 https://access.redhat.com/errata/RHSA-2020:2050
USN-4353-1 https://usn.ubuntu.com/4353-1/
USN-4373-1 https://usn.ubuntu.com/4373-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12395.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:L/Au:N/C:C/I:C/A:C Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12395
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:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12395
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 0.7833
EPSS Score 0.01231
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:39.544846+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-18.yml 37.0.0