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Vulnerability details: VCID-e3j5-kyhm-7ye1
Vulnerability ID VCID-e3j5-kyhm-7ye1
Aliases CVE-2020-15667
Summary When processing a MAR update file, after the signature has been validated, an invalid name length could result in a heap overflow, leading to memory corruption and potentially arbitrary code execution. Within Firefox as released by Mozilla, this issue is only exploitable with the Mozilla-controlled signing key.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-122 Heap-based Buffer Overflow
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15667.json
epss 0.00891 https://api.first.org/data/v1/epss?cve=CVE-2020-15667
epss 0.00891 https://api.first.org/data/v1/epss?cve=CVE-2020-15667
epss 0.00891 https://api.first.org/data/v1/epss?cve=CVE-2020-15667
epss 0.00891 https://api.first.org/data/v1/epss?cve=CVE-2020-15667
epss 0.00891 https://api.first.org/data/v1/epss?cve=CVE-2020-15667
epss 0.00891 https://api.first.org/data/v1/epss?cve=CVE-2020-15667
epss 0.00891 https://api.first.org/data/v1/epss?cve=CVE-2020-15667
epss 0.00891 https://api.first.org/data/v1/epss?cve=CVE-2020-15667
epss 0.00891 https://api.first.org/data/v1/epss?cve=CVE-2020-15667
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-36
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-15667.json
https://api.first.org/data/v1/epss?cve=CVE-2020-15667
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1884474 https://bugzilla.redhat.com/show_bug.cgi?id=1884474
mfsa2020-36 https://www.mozilla.org/en-US/security/advisories/mfsa2020-36
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-2020-15667.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: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
Exploit Prediction Scoring System (EPSS)
Percentile 0.75491
EPSS Score 0.00891
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:17:05.613386+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-36.yml 38.0.0