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Vulnerability details: VCID-wmtc-5w42-kyba
Vulnerability ID VCID-wmtc-5w42-kyba
Aliases CVE-2020-15659
Summary Mozilla developers and community members Natalia Csoregi, Simon Giesecke, Jason Kratzer, Christian Holler, and Luke Wagner reported memory safety bugs present in Firefox 78 and Firefox ESR 78.0. 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 8.4
Risk 4.2
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-787 Out-of-bounds Write
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15659.json
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
epss 0.0078 https://api.first.org/data/v1/epss?cve=CVE-2020-15659
cvssv3.1 8.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 9.3 https://nvd.nist.gov/vuln/detail/CVE-2020-15659
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2020-15659
archlinux High https://security.archlinux.org/AVG-1213
archlinux High https://security.archlinux.org/AVG-1214
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-30
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-31
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-32
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-33
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-35
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00022.html
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.html
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00032.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15659.json
https://api.first.org/data/v1/epss?cve=CVE-2020-15659
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1550133%2C1633880%2C1643613%2C1644839%2C1645835%2C1646006%2C1646787%2C1649347%2C1650811%2C1651678
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15652
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15659
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6463
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6514
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2020-30/
https://www.mozilla.org/security/advisories/mfsa2020-31/
https://www.mozilla.org/security/advisories/mfsa2020-32/
https://www.mozilla.org/security/advisories/mfsa2020-33/
https://www.mozilla.org/security/advisories/mfsa2020-35/
1861572 https://bugzilla.redhat.com/show_bug.cgi?id=1861572
AVG-1213 https://security.archlinux.org/AVG-1213
AVG-1214 https://security.archlinux.org/AVG-1214
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:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
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: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-2020-15659 https://nvd.nist.gov/vuln/detail/CVE-2020-15659
mfsa2020-30 https://www.mozilla.org/en-US/security/advisories/mfsa2020-30
mfsa2020-31 https://www.mozilla.org/en-US/security/advisories/mfsa2020-31
mfsa2020-32 https://www.mozilla.org/en-US/security/advisories/mfsa2020-32
mfsa2020-33 https://www.mozilla.org/en-US/security/advisories/mfsa2020-33
mfsa2020-35 https://www.mozilla.org/en-US/security/advisories/mfsa2020-35
RHSA-2020:3229 https://access.redhat.com/errata/RHSA-2020:3229
RHSA-2020:3233 https://access.redhat.com/errata/RHSA-2020:3233
RHSA-2020:3241 https://access.redhat.com/errata/RHSA-2020:3241
RHSA-2020:3253 https://access.redhat.com/errata/RHSA-2020:3253
RHSA-2020:3254 https://access.redhat.com/errata/RHSA-2020:3254
RHSA-2020:3341 https://access.redhat.com/errata/RHSA-2020:3341
RHSA-2020:3342 https://access.redhat.com/errata/RHSA-2020:3342
RHSA-2020:3343 https://access.redhat.com/errata/RHSA-2020:3343
RHSA-2020:3344 https://access.redhat.com/errata/RHSA-2020:3344
RHSA-2020:3345 https://access.redhat.com/errata/RHSA-2020:3345
USN-4443-1 https://usn.ubuntu.com/4443-1/
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-2020-15659.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: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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-2020-15659
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-2020-15659
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 0.72742
EPSS Score 0.0078
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:41.257217+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-33.yml 37.0.0