CVE-2020-6805

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory 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.

When removing data about an origin whose tab was recently closed, a use-after-free could occur in the Quota manager, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

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
68%
KEV
Not listed

Published

March 25, 2020

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Firefox 74 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-08/
generic

1610880 - (CVE-2020-6805) heap-use-after-free (READ of size 8) in mozilla::dom::quota::QuotaObject::LockedMaybeUpdateSize

https://bugzilla.mozilla.org/show_bug.cgi?id=1610880
generic

Security Vulnerabilities fixed in Thunderbird 68.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-10/
generic

Security Vulnerabilities fixed in Firefox ESR 68.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2020-09/

Vendor Advisories for CVE-2020-6805(8)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxul-ext-lightning (1:68.7.0+build1-0ubuntu0.19.10.1) @ eoan2026-05-23ubuntu
ubuntuxul-ext-lightning (1:68.7.0+build1-0ubuntu0.16.04.2) @ xenial2026-05-23ubuntu
ubuntufirefox-mozsymbols (74.0+build3-0ubuntu0.16.04.1) @ xenial2026-05-23ubuntu
redhatthunderbird-0:68.6.0-1.el6_102020-03-23redhat
redhatthunderbird-0:68.6.0-1.el8_12020-03-23redhat
redhatthunderbird-0:68.6.0-1.el8_02020-03-23redhat
redhatthunderbird-0:68.6.0-1.el7_72020-03-19redhat
redhatfirefox-0:68.6.0-1.el8_12020-03-16redhat
redhatfirefox-0:68.6.0-1.el7_72020-03-16redhat
redhatfirefox-0:68.6.0-1.el6_102020-03-16redhat
redhatfirefox-0:68.6.0-1.el8_02020-03-16redhat

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 ... 68.6.0esr-1~deb9u1 (35 versions)68.6.0esr-1~deb10u1—
thunderbird1:60.7.2-1 ... 1:68.6.0-1~deb9u1 (38 versions)1:68.6.0-1~deb10u1—
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.6.0esr-1—
thunderbird—1:68.6.0-1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.6.0esr-1—
thunderbird—1:68.6.0-1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.6.0esr-1—
thunderbird—1:68.6.0-1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.6.0esr-1—
thunderbird—1:68.6.0-1—
Debian:8(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.0.1esr-1 ... 68.5.0esr-1~deb9u1 (179 versions)68.6.0esr-1~deb8u1—
thunderbird1.5-4 ... 1:68.5.0-1~deb9u1 (118 versions)1:68.6.0-1~deb8u1—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 68.6.0esr-1~deb8u1 (142 versions)68.6.0esr-1~deb9u1—
thunderbird1.5-4 ... 1:68.6.0-1~deb8u1 (119 versions)1:68.6.0-1~deb9u1—

Weakness Classification(1)

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

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 28× 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 129 total refreshes for this CVE.

  1. 2026-08-19 17:00 UTCEPSS rescore
  2. 2026-08-18 13:44 UTCEPSS rescore
  3. 2026-08-17 13:43 UTCEPSS rescore
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  7. 2026-08-15 01:27 UTCEPSS rescore
  8. 2026-08-14 23:24 UTCOSV refresh
  9. 2026-08-13 21:57 UTCEPSS rescore
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  11. 2026-08-09 13:43 UTCEPSS rescore
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  20. 2026-07-30 16:25 UTCEPSS rescore
  21. 2026-07-30 11:44 UTCOSV refresh
  22. 2026-07-30 01:27 UTCEPSS rescore
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  24. 2026-07-26 14:52 UTCEPSS rescore
  25. 2026-07-25 14:15 UTCEPSS rescore
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  1. 2026-07-24 14:15 UTCEPSS rescore
  2. 2026-07-23 14:15 UTCEPSS rescore
  3. 2026-07-23 01:54 UTCEG score recompute
  4. 2026-07-22 22:40 UTCEG score recompute
  5. 2026-07-22 14:05 UTCEPSS rescore
  6. 2026-07-21 15:22 UTCEPSS rescore
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  8. 2026-07-20 17:04 UTCEPSS rescore
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  19. 2026-07-13 06:10 UTCEPSS rescore
  20. 2026-07-13 06:10 UTCEPSS rescore
  21. 2026-07-12 21:07 UTCOSV refresh
  22. 2026-07-12 05:44 UTCEPSS rescore
  23. 2026-07-12 05:44 UTCEPSS rescore
  24. 2026-07-11 08:25 UTCEPSS rescore
  25. 2026-07-11 08:25 UTCEPSS rescore
  26. 2026-07-09 19:07 UTCEPSS rescore
  27. 2026-07-08 15:12 UTCEPSS rescore
  28. 2026-07-07 13:43 UTCEPSS rescore
  29. 2026-07-06 16:25 UTCEPSS rescore
  30. 2026-07-06 02:21 UTCEPSS rescore
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  36. 2026-07-02 16:57 UTCEPSS rescore
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  40. 2026-06-29 14:04 UTCEPSS rescore
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  44. 2026-06-27 03:06 UTCEPSS rescore
  45. 2026-06-27 03:06 UTCEPSS rescore
  46. 2026-06-25 13:48 UTCEPSS rescore
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  48. 2026-06-24 14:03 UTCEPSS rescore
  49. 2026-06-24 14:03 UTCEPSS rescore
  50. 2026-06-24 06:50 UTCOSV refresh
  51. 2026-06-23 21:31 UTCEPSS rescore
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  53. 2026-06-22 14:23 UTCEPSS rescore
  54. 2026-06-21 14:54 UTCEPSS rescore
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  60. 2026-06-18 17:51 UTCEPSS rescore
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  66. 2026-06-13 22:58 UTCEPSS rescore
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  68. 2026-06-12 23:10 UTCEPSS rescore
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  70. 2026-06-11 13:58 UTCEPSS rescore
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  72. 2026-06-10 22:16 UTCEPSS rescore
  73. 2026-06-10 13:20 UTCEPSS rescore
  74. 2026-06-08 14:15 UTCEPSS rescore
  75. 2026-06-07 15:23 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2020-6805?
CVE-2020-6805 is a high vulnerability published on March 25, 2020. When removing data about an origin whose tab was recently closed, a use-after-free could occur in the Quota manager, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.
When was CVE-2020-6805 disclosed?
CVE-2020-6805 was first published in the National Vulnerability Database on March 25, 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-2020-6805 actively exploited?
CVE-2020-6805 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 32.2% of all scored CVEs.
What is the CVSS score of CVE-2020-6805?
CVE-2020-6805 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2020-6805?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-6805, 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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