CVE-2020-6822

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 1.3%, top 33% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, 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.

On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in GMPDecodeData. It is possible that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.

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
70%
KEV
Not listed

Published

April 24, 2020

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Aug 24, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 68.7.0 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-14/
generic

Security Vulnerabilities fixed in Firefox ESR 68.7 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-13/
generic

Security Vulnerabilities fixed in Firefox 75 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-12/
generic

1544181 - (CVE-2020-6822) Potential out-of-bounds write in GMPDecodeData

https://bugzilla.mozilla.org/show_bug.cgi?id=1544181

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-mozsymbols (75.0+build3-0ubuntu0.16.04.1) @ xenial2026-05-27ubuntu
ubuntuxul-ext-lightning (1:68.7.0+build1-0ubuntu0.18.04.1) @ bionic2026-05-27ubuntu
ubuntuxul-ext-lightning (1:68.7.0+build1-0ubuntu0.16.04.2) @ xenial2026-05-27ubuntu
redhatthunderbird-0:68.7.0-1.el8_12020-04-16redhat
redhatthunderbird-0:68.7.0-1.el6_102020-04-16redhat
redhatthunderbird-0:68.7.0-1.el7_82020-04-16redhat
redhatthunderbird-0:68.7.0-1.el8_02020-04-16redhat
redhatfirefox-0:68.7.0-2.el6_102020-04-14redhat
redhatfirefox-0:68.7.0-2.el7_82020-04-09redhat
redhatfirefox-0:68.7.0-2.el8_12020-04-08redhat
redhatfirefox-0:68.7.0-2.el8_02020-04-08redhat

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 ... 68.7.0esr-1~deb9u1 (42 versions)68.7.0esr-1~deb10u1—
thunderbird1:60.7.2-1 ... 1:68.7.0-1~deb9u1 (42 versions)1:68.7.0-1~deb10u1—
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.7.0esr-1—
thunderbird—1:68.7.0-1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.7.0esr-1—
thunderbird—1:68.7.0-1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.7.0esr-1—
thunderbird—1:68.7.0-1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.7.0esr-1—
thunderbird—1:68.7.0-1—
Debian:8(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.0.1esr-1 ... 68.6.1esr-1~deb9u1 (186 versions)68.7.0esr-1~deb8u1—
thunderbird1.5-4 ... 1:68.6.0-1~deb9u1 (122 versions)1:68.7.0-1~deb8u1—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 68.7.0esr-1~deb8u1 (149 versions)68.7.0esr-1~deb9u1—
thunderbird1.5-4 ... 1:68.7.0-1~deb8u1 (123 versions)1:68.7.0-1~deb9u1—

Weakness Classification(1)

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

All Vendor Advisories

(11)

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 6× in last 7d / 22× 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 154 total refreshes for this CVE.

  1. 2026-09-19 15:37 UTCEPSS rescore
  2. 2026-09-18 19:23 UTCEPSS rescore
  3. 2026-09-17 19:22 UTCEPSS rescore
  4. 2026-09-16 14:04 UTCEPSS rescore
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  9. 2026-09-07 15:58 UTCEPSS rescore
  10. 2026-09-07 13:48 UTCOSV refresh
  11. 2026-09-06 13:44 UTCEPSS rescore
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  22. 2026-08-21 23:45 UTCEPSS rescore
  23. 2026-08-20 23:15 UTCOSV refresh
  24. 2026-08-19 17:00 UTCEPSS rescore
  25. 2026-08-18 13:44 UTCEPSS rescore
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  1. 2026-08-17 13:43 UTCEPSS rescore
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  3. 2026-08-16 14:52 UTCEPSS rescore
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  5. 2026-08-15 01:27 UTCEPSS rescore
  6. 2026-08-13 21:57 UTCEPSS rescore
  7. 2026-08-12 13:47 UTCEPSS rescore
  8. 2026-08-09 13:43 UTCEPSS rescore
  9. 2026-08-08 16:33 UTCEPSS rescore
  10. 2026-08-07 16:23 UTCEPSS rescore
  11. 2026-08-06 13:43 UTCEPSS rescore
  12. 2026-08-05 19:14 UTCEPSS rescore
  13. 2026-08-05 14:41 UTCOSV refresh
  14. 2026-08-04 15:06 UTCEPSS rescore
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  20. 2026-07-28 15:33 UTCEPSS rescore
  21. 2026-07-26 14:52 UTCEPSS rescore
  22. 2026-07-25 14:15 UTCEPSS rescore
  23. 2026-07-24 14:15 UTCEPSS rescore
  24. 2026-07-23 14:15 UTCEPSS rescore
  25. 2026-07-23 01:54 UTCEG score recompute
  26. 2026-07-22 22:40 UTCEG score recompute
  27. 2026-07-22 14:05 UTCEPSS rescore
  28. 2026-07-21 15:22 UTCEPSS rescore
  29. 2026-07-21 15:22 UTCEPSS rescore
  30. 2026-07-20 17:04 UTCEPSS rescore
  31. 2026-07-20 17:04 UTCEPSS rescore
  32. 2026-07-19 14:28 UTCEPSS rescore
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  34. 2026-07-19 13:54 UTCOSV refresh
  35. 2026-07-19 02:26 UTCEPSS rescore
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  37. 2026-07-18 10:02 UTCEPSS rescore
  38. 2026-07-16 17:00 UTCEPSS rescore
  39. 2026-07-15 16:55 UTCEPSS rescore
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  41. 2026-07-15 01:57 UTCEPSS rescore
  42. 2026-07-13 22:27 UTCEPSS rescore
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  44. 2026-07-13 06:10 UTCEPSS rescore
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  46. 2026-07-12 05:44 UTCEPSS rescore
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  48. 2026-07-11 08:25 UTCEPSS rescore
  49. 2026-07-11 08:25 UTCEPSS rescore
  50. 2026-07-09 19:07 UTCEPSS rescore
  51. 2026-07-08 15:12 UTCEPSS rescore
  52. 2026-07-07 13:43 UTCEPSS rescore
  53. 2026-07-06 16:25 UTCEPSS rescore
  54. 2026-07-06 02:21 UTCEPSS rescore
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  56. 2026-07-05 02:28 UTCEPSS rescore
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  58. 2026-07-04 06:29 UTCEPSS rescore
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  60. 2026-07-02 16:57 UTCEPSS rescore
  61. 2026-07-02 00:01 UTCOSV refresh
  62. 2026-07-01 15:03 UTCEPSS rescore
  63. 2026-06-30 23:20 UTCEPSS rescore
  64. 2026-06-30 23:20 UTCEPSS rescore
  65. 2026-06-29 14:04 UTCEPSS rescore
  66. 2026-06-28 14:05 UTCEPSS rescore
  67. 2026-06-28 04:54 UTCEPSS rescore
  68. 2026-06-28 04:54 UTCEPSS rescore
  69. 2026-06-27 03:06 UTCEPSS rescore
  70. 2026-06-27 03:06 UTCEPSS rescore
  71. 2026-06-25 13:48 UTCEPSS rescore
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  73. 2026-06-24 14:03 UTCEPSS rescore
  74. 2026-06-24 14:03 UTCEPSS rescore
  75. 2026-06-23 21:31 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2020-6822?
CVE-2020-6822 is a high vulnerability published on April 24, 2020. On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in <code>GMPDecodeData</code>. It is possible that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and…
When was CVE-2020-6822 disclosed?
CVE-2020-6822 was first published in the National Vulnerability Database on April 24, 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-2020-6822 actively exploited?
CVE-2020-6822 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 30.3% of all scored CVEs.
What is the CVSS score of CVE-2020-6822?
CVE-2020-6822 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2020-6822?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-6822, 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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