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Vulnerability details: VCID-qg13-nvug-6fb8
Vulnerability ID VCID-qg13-nvug-6fb8
Aliases CVE-2020-15669
Summary When aborting an operation, such as a fetch, an abort signal may be deleted while alerting the objects to be notified. This results in a use-after-free and we presume that with enough effort it could have been exploited to run arbitrary code.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15669.json
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
epss 0.00451 https://api.first.org/data/v1/epss?cve=CVE-2020-15669
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2020-15669
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2020-15669
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-37
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-40
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15669.json
https://api.first.org/data/v1/epss?cve=CVE-2020-15669
https://bugzilla.mozilla.org/show_bug.cgi?id=1656957
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15664
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15669
https://www.mozilla.org/security/advisories/mfsa2020-37/
https://www.mozilla.org/security/advisories/mfsa2020-40/
1872532 https://bugzilla.redhat.com/show_bug.cgi?id=1872532
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:*:*:*:*:*:*:*:*
CVE-2020-15669 https://nvd.nist.gov/vuln/detail/CVE-2020-15669
mfsa2020-37 https://www.mozilla.org/en-US/security/advisories/mfsa2020-37
mfsa2020-40 https://www.mozilla.org/en-US/security/advisories/mfsa2020-40
RHSA-2020:3555 https://access.redhat.com/errata/RHSA-2020:3555
RHSA-2020:3556 https://access.redhat.com/errata/RHSA-2020:3556
RHSA-2020:3557 https://access.redhat.com/errata/RHSA-2020:3557
RHSA-2020:3558 https://access.redhat.com/errata/RHSA-2020:3558
RHSA-2020:3559 https://access.redhat.com/errata/RHSA-2020:3559
RHSA-2020:3631 https://access.redhat.com/errata/RHSA-2020:3631
RHSA-2020:3632 https://access.redhat.com/errata/RHSA-2020:3632
RHSA-2020:3633 https://access.redhat.com/errata/RHSA-2020:3633
RHSA-2020:3634 https://access.redhat.com/errata/RHSA-2020:3634
RHSA-2020:3643 https://access.redhat.com/errata/RHSA-2020:3643
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-2020-15669.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:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-15669
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-2020-15669
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 0.6274
EPSS Score 0.00451
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:41.921511+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-40.yml 37.0.0