CVE-2020-15667
When processing a MAR update file, after the signature has been validated, an invalid name length...
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. This vulnerability affects Firefox < 80.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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. This vulnerability affects Firefox < 80.
- Record
CVE-2020-15667- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-787
- Updated
- 2026-11-02
CVE List No score
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. This vulnerability affects Firefox < 80.
- Record
CVE-2020-15667- Updated
- 2026-11-02
EUVDEUVD-2020-7654 No score
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. This vulnerability affects Firefox < 80.
- Record
EUVD-2020-7654- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-93j6-6353-95h4 No score
When processing a MAR update file, after the signature has been validated, an invalid name length...
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. This vulnerability affects Firefox < 80.
- Record
GHSA-93j6-6353-95h4- Weakness
- CWE-434
- Updated
- 2026-11-02
OSVALPINE-CVE-2020-15667
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. This vulnerability affects Firefox < 80.
- Record
ALPINE-CVE-2020-15667- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
OSVUBUNTU-CVE-2020-15667
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. This vulnerability affects Firefox < 80.
- Record
UBUNTU-CVE-2020-15667- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10600-1 No score
MozillaFirefox-92.0-1.2 on GA media
These are all security issues fixed in the MozillaFirefox-92.0-1.2 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10600-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:14572-1 No score
firefox-esr-128.5.1-1.1 on GA media
These are all security issues fixed in the firefox-esr-128.5.1-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:14572-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
firefoxAlpine:v3.12 |
before 80.0-r0 | 80.0-r0 |
firefoxAlpine:v3.13 |
before 80.0-r0 | 80.0-r0 |
firefoxAlpine:v3.14 |
before 80.0-r0 | 80.0-r0 |
firefoxAlpine:v3.15 |
before 80.0-r0 | 80.0-r0 |
firefoxAlpine:v3.16 |
before 80.0-r0 | 80.0-r0 |
firefoxAlpine:v3.17 |
before 80.0-r0 | 80.0-r0 |
firefoxAlpine:v3.18 |
before 80.0-r0 | 80.0-r0 |
firefoxAlpine:v3.19 |
before 80.0-r0 | 80.0-r0 |
firefoxAlpine:v3.20 |
before 80.0-r0 | 80.0-r0 |
firefoxAlpine:v3.21 |
before 80.0-r0 | 80.0-r0 |
Show 12 moreShow less
| Package | Affected | Fixed |
|---|---|---|
firefoxAlpine:v3.22 |
before 80.0-r0 | 80.0-r0 |
firefoxAlpine:v3.23 |
before 80.0-r0 | 80.0-r0 |
librewolfAlpine:v3.21 |
before 80.0-r0 | 80.0-r0 |
librewolfAlpine:v3.22 |
before 80.0-r0 | 80.0-r0 |
librewolfAlpine:v3.23 |
before 80.0-r0 | 80.0-r0 |
librewolfAlpine:v3.24 |
before 80.0-r0 | 80.0-r0 |
mozjs52Ubuntu:18.04:LTS |
All versions, plus listed versions 52.3.1-0ubuntu352.3.1-7fakesync152.8.1-0ubuntu0.18.04.152.9.1-0ubuntu0.18.04.1 |
None known |
mozjs38Ubuntu:18.04:LTS |
All versions, plus listed versions 38.8.0~repack1-0ubuntu138.8.0~repack1-0ubuntu338.8.0~repack1-0ubuntu4 |
None known |
mozjs68Ubuntu:20.04:LTS |
All versions, plus listed versions 68.5.0-1~fakesync68.5.0-2~fakesync68.6.0-168.6.0-1ubuntu1 |
None known |
mozjs52Ubuntu:20.04:LTS |
All versions, plus listed versions 52.9.1-1build152.9.1-1ubuntu3 |
None known |
MozillaFirefoxopenSUSE:Tumbleweed From an advisory covering 661 CVEs |
before 92.0-1.2 | 92.0-1.2 |
firefox-esropenSUSE:Tumbleweed From an advisory covering 1860 CVEs |
before 128.5.1-1.1 | 128.5.1-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| affected, aliases, references | OSV | |
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-15667 is a high vulnerability (CVSS 8.8) in Mozilla Firefox, published October 1, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.65%, the 76th percentile. Fixed in firefox 80.0-r0.
References
mozilla.org/security/advisories/mfsa2020-36
bugzilla.mozilla.org/show_bug.cgi?id=1653371
nvd.nist.gov/vuln/detail/CVE-2020-15667
github.com/advisories/GHSA-93j6-6353-95h4
security.alpinelinux.org/vuln/CVE-2020-15667
ubuntu.com/security/CVE-2020-15667
Show 194 moreShow less
cve.org/CVERecord?id=CVE-2020-15667
suse.com/security/cve/CVE-2006-6077
lists.opensuse.org/archives/list/[email protected]/thread/3HI2RC7AJAHY74Q6MK7GNGWU6TITB22V
Left out here: 1,669 references. The JSON record has them.