CVE catalog

CVE-2020-15667

UBUNTU-

[CVE catalog]

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.

Severity
High · CVSS 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
Updated
Source
[NVD] · [CVE record]
EPSS
1.65% · Oct 27, 2026

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / releasePackageVersionStatusSource
Ubuntu20.04mozjs5252.9.1-1build1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu20.04mozjs5252.9.1-1ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu20.04mozjs6868.5.0-1~fakesyncUnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu20.04mozjs6868.5.0-2~fakesyncUnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu20.04mozjs6868.6.0-1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu20.04mozjs6868.6.0-1ubuntu1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs3838.8.0~repack1-0ubuntu1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs3838.8.0~repack1-0ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs3838.8.0~repack1-0ubuntu4UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs5252.3.1-0ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs5252.3.1-7fakesync1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs5252.8.1-0ubuntu0.18.04.1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]

Showing 12 observations. All 13 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence
Distribution / releasePackageVersionStatusSource
Ubuntu18.04mozjs3838.8.0~repack1-0ubuntu1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs3838.8.0~repack1-0ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs3838.8.0~repack1-0ubuntu4UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs5252.3.1-0ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs5252.3.1-7fakesync1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs5252.8.1-0ubuntu0.18.04.1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu18.04mozjs5252.9.1-0ubuntu0.18.04.1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu20.04mozjs5252.9.1-1build1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu20.04mozjs5252.9.1-1ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu20.04mozjs6868.5.0-1~fakesyncUnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu20.04mozjs6868.5.0-2~fakesyncUnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu20.04mozjs6868.6.0-1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Ubuntu20.04mozjs6868.6.0-1ubuntu1UnknownSource applicability is not established[UBUNTU-CVE-2020-15667]
Original provider fields
{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "mozjs52",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "18.04",
      "versions": [
        "52.3.1-0ubuntu3",
        "52.3.1-7fakesync1",
        "52.8.1-0ubuntu0.18.04.1",
        "52.9.1-0ubuntu0.18.04.1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-15667",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-15667",
      "provider_updated_at": "2026-04-22T12:19:54.173881Z",
      "applicability_unknown": true
    },
    {
      "name": "mozjs38",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "18.04",
      "versions": [
        "38.8.0~repack1-0ubuntu1",
        "38.8.0~repack1-0ubuntu3",
        "38.8.0~repack1-0ubuntu4"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-15667",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-15667",
      "provider_updated_at": "2026-04-22T12:19:54.173881Z",
      "applicability_unknown": true
    },
    {
      "name": "mozjs68",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "20.04",
      "versions": [
        "68.5.0-1~fakesync",
        "68.5.0-2~fakesync",
        "68.6.0-1",
        "68.6.0-1ubuntu1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-15667",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-15667",
      "provider_updated_at": "2026-04-22T12:19:54.173881Z",
      "applicability_unknown": true
    },
    {
      "name": "mozjs52",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "20.04",
      "versions": [
        "52.9.1-1build1",
        "52.9.1-1ubuntu3"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-15667",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-15667",
      "provider_updated_at": "2026-04-22T12:19:54.173881Z",
      "applicability_unknown": true
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

Observed:

References

[FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]