CVE-2020-12406

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

Mozilla Developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
62%
KEV
Not listed

Published

July 9, 2020

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Jul 28, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 68.9.0 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-22/
generic

Security Vulnerabilities fixed in Firefox ESR 68.9 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-21/
generic

Security Vulnerabilities fixed in Firefox 77 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-20/
generic

1639590 - (CVE-2020-12406) Fix GetOwnPropertyPure

https://bugzilla.mozilla.org/show_bug.cgi?id=1639590

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxul-ext-lightning (1:68.10.0+build1-0ubuntu0.16.04.1) @ xenial2026-05-27ubuntu
ubuntufirefox-mozsymbols (77.0.1+build1-0ubuntu0.16.04.1) @ xenial2026-05-27ubuntu
redhatthunderbird-0:68.9.0-1.el8_22020-06-22redhat
redhatthunderbird-0:68.9.0-1.el7_82020-06-22redhat
redhatthunderbird-0:68.9.0-1.el6_102020-06-19redhat
redhatthunderbird-0:68.9.0-1.el8_12020-06-19redhat
redhatthunderbird-0:68.9.0-1.el8_02020-06-19redhat
redhatfirefox-0:68.9.0-1.el8_22020-06-03redhat
redhatfirefox-0:68.9.0-1.el8_12020-06-03redhat
redhatfirefox-0:68.9.0-1.el6_102020-06-03redhat
redhatfirefox-0:68.9.0-1.el7_82020-06-03redhat
redhatfirefox-0:68.9.0-1.el8_02020-06-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(14 across 7 ecosystems)
Debian:10(2)
PackageVulnerable rangeFixed inDependents
firefox-esr60.7.2esr-1 ... 68.9.0esr-1~deb9u1 (51 versions)68.9.0esr-1~deb10u1—
thunderbird1:60.7.2-1 ... 1:68.9.0-1~deb9u1 (52 versions)1:68.9.0-1~deb10u1—
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.9.0esr-1—
thunderbird—1:68.9.0-1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.9.0esr-1—
thunderbird—1:68.9.0-1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.9.0esr-1—
thunderbird—1:68.9.0-1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.9.0esr-1—
thunderbird—1:68.9.0-1—
Debian:8(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.0.1esr-1 ... 68.9.0esr-1~deb8u1 (195 versions)68.9.0esr-1~deb8u2—
thunderbird1.5-4 ... 1:68.9.0-1~deb8u1 (132 versions)1:68.9.0-1~deb8u2—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 68.9.0esr-1~deb8u2 (158 versions)68.9.0esr-1~deb9u1—
thunderbird1.5-4 ... 1:68.9.0-1~deb8u2 (133 versions)1:68.9.0-1~deb9u1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(12)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 151 total refreshes for this CVE.

  1. 2026-09-18 19:23 UTCEPSS rescore
  2. 2026-09-17 19:22 UTCEPSS rescore
  3. 2026-09-16 14:04 UTCEPSS rescore
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  10. 2026-09-07 15:57 UTCEPSS rescore
  11. 2026-09-07 05:48 UTCOSV refresh
  12. 2026-09-06 13:44 UTCEPSS rescore
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  24. 2026-08-20 22:51 UTCEPSS rescore
  25. 2026-08-20 16:01 UTCOSV refresh
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  1. 2026-08-19 17:00 UTCEPSS rescore
  2. 2026-08-18 13:44 UTCEPSS rescore
  3. 2026-08-17 13:43 UTCEPSS rescore
  4. 2026-08-16 14:52 UTCEPSS rescore
  5. 2026-08-16 02:11 UTCEPSS rescore
  6. 2026-08-15 01:26 UTCEPSS rescore
  7. 2026-08-13 21:57 UTCEPSS rescore
  8. 2026-08-12 13:47 UTCEPSS rescore
  9. 2026-08-09 13:43 UTCEPSS rescore
  10. 2026-08-08 16:33 UTCEPSS rescore
  11. 2026-08-07 16:23 UTCEPSS rescore
  12. 2026-08-06 13:43 UTCEPSS rescore
  13. 2026-08-05 19:14 UTCEPSS rescore
  14. 2026-08-05 10:11 UTCOSV refresh
  15. 2026-08-04 15:06 UTCEPSS rescore
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  18. 2026-08-02 02:23 UTCEPSS rescore
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  20. 2026-07-30 16:24 UTCEPSS rescore
  21. 2026-07-30 01:27 UTCEPSS rescore
  22. 2026-07-28 15:32 UTCEPSS rescore
  23. 2026-07-26 14:51 UTCEPSS rescore
  24. 2026-07-25 14:14 UTCEPSS rescore
  25. 2026-07-24 14:14 UTCEPSS rescore
  26. 2026-07-23 14:15 UTCEPSS rescore
  27. 2026-07-23 14:15 UTCEPSS rescore
  28. 2026-07-23 01:48 UTCEG score recompute
  29. 2026-07-22 22:33 UTCEG score recompute
  30. 2026-07-22 14:05 UTCEPSS rescore
  31. 2026-07-21 15:22 UTCEPSS rescore
  32. 2026-07-21 15:22 UTCEPSS rescore
  33. 2026-07-20 17:04 UTCEPSS rescore
  34. 2026-07-19 14:28 UTCEPSS rescore
  35. 2026-07-19 14:28 UTCEPSS rescore
  36. 2026-07-19 09:22 UTCOSV refresh
  37. 2026-07-19 02:26 UTCEPSS rescore
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  39. 2026-07-18 10:02 UTCEPSS rescore
  40. 2026-07-16 16:59 UTCEPSS rescore
  41. 2026-07-16 16:59 UTCEPSS rescore
  42. 2026-07-15 16:55 UTCEPSS rescore
  43. 2026-07-13 22:27 UTCEPSS rescore
  44. 2026-07-13 06:10 UTCEPSS rescore
  45. 2026-07-13 06:10 UTCEPSS rescore
  46. 2026-07-12 05:44 UTCEPSS rescore
  47. 2026-07-11 08:24 UTCEPSS rescore
  48. 2026-07-09 19:06 UTCEPSS rescore
  49. 2026-07-08 15:11 UTCEPSS rescore
  50. 2026-07-07 13:43 UTCEPSS rescore
  51. 2026-07-06 16:25 UTCEPSS rescore
  52. 2026-07-06 16:25 UTCEPSS rescore
  53. 2026-07-06 02:20 UTCEPSS rescore
  54. 2026-07-05 02:27 UTCEPSS rescore
  55. 2026-07-04 06:28 UTCEPSS rescore
  56. 2026-07-01 15:03 UTCEPSS rescore
  57. 2026-07-01 15:03 UTCEPSS rescore
  58. 2026-07-01 15:01 UTCOSV refresh
  59. 2026-06-30 23:20 UTCEPSS rescore
  60. 2026-06-30 23:20 UTCEPSS rescore
  61. 2026-06-28 14:05 UTCEPSS rescore
  62. 2026-06-28 04:54 UTCEPSS rescore
  63. 2026-06-28 04:54 UTCEPSS rescore
  64. 2026-06-27 03:06 UTCEPSS rescore
  65. 2026-06-25 13:47 UTCEPSS rescore
  66. 2026-06-25 13:47 UTCEPSS rescore
  67. 2026-06-24 14:03 UTCEPSS rescore
  68. 2026-06-24 14:03 UTCEPSS rescore
  69. 2026-06-23 21:31 UTCEPSS rescore
  70. 2026-06-23 21:31 UTCEPSS rescore
  71. 2026-06-22 14:23 UTCEPSS rescore
  72. 2026-06-22 14:23 UTCEPSS rescore
  73. 2026-06-21 14:54 UTCEPSS rescore
  74. 2026-06-21 14:54 UTCEPSS rescore
  75. 2026-06-21 01:57 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2020-12406?
CVE-2020-12406 is a high vulnerability published on July 9, 2020. Mozilla Developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.
When was CVE-2020-12406 disclosed?
CVE-2020-12406 was first published in the National Vulnerability Database on July 9, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-12406 actively exploited?
CVE-2020-12406 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 38.2% of all scored CVEs.
What is the CVSS score of CVE-2020-12406?
CVE-2020-12406 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2020-12406?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-12406, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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