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Vulnerability details: VCID-hrd9-w8w3-fyaq
Vulnerability ID VCID-hrd9-w8w3-fyaq
Aliases CVE-2020-26969
Summary Mozilla developers Tyson Smith, Aaron Klotz, David Major and Jason Kratzer reported memory safety bugs present in Firefox 82. 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 (1)
CWE-787 Out-of-bounds Write
System Score Found at
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
epss 0.00774 https://api.first.org/data/v1/epss?cve=CVE-2020-26969
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 9.3 https://nvd.nist.gov/vuln/detail/CVE-2020-26969
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2020-26969
archlinux Critical https://security.archlinux.org/AVG-1279
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-50
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2020-26969
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1623920%2C1651705%2C1667872%2C1668876
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2020-50/
ASA-202011-12 https://security.archlinux.org/ASA-202011-12
AVG-1279 https://security.archlinux.org/AVG-1279
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:*:*:*:*:*:*:*:*
CVE-2020-26969 https://nvd.nist.gov/vuln/detail/CVE-2020-26969
mfsa2020-50 https://www.mozilla.org/en-US/security/advisories/mfsa2020-50
USN-4637-1 https://usn.ubuntu.com/4637-1/
USN-4637-2 https://usn.ubuntu.com/4637-2/
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://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-2020-26969
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-2020-26969
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 0.72608
EPSS Score 0.00774
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:43.926843+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-50.yml 37.0.0