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: 1.5%CVSS: 8.8Exploit: None knownExposed services: Not assessed

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
8.8HIGHmedium confidence
EG Risk
45
EG Risk 45/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.5%
EPSS %ILE
73rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

March 25, 2020

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Aug 6, 2026
Patch available.
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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
firefox-esr60.7.2esr-1 ... 68.6.0esr-1~deb9u1 (35 versions)
  • every version up to 68.6.0esr-1~deb10u1: fixed in 68.6.0esr-1~deb10u1
—
thunderbird1:60.7.2-1 ... 1:68.6.0-1~deb9u1 (38 versions)
  • every version up to 1:68.6.0-1~deb10u1: fixed in 1:68.6.0-1~deb10u1
—
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 68.6.0esr-1: fixed in 68.6.0esr-1
—
thunderbird—
  • every version up to 1:68.6.0-1: fixed in 1:68.6.0-1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 68.6.0esr-1: fixed in 68.6.0esr-1
—
thunderbird—
  • every version up to 1:68.6.0-1: fixed in 1:68.6.0-1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 68.6.0esr-1: fixed in 68.6.0esr-1
—
thunderbird—
  • every version up to 1:68.6.0-1: fixed in 1:68.6.0-1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 68.6.0esr-1: fixed in 68.6.0esr-1
—
thunderbird—
  • every version up to 1:68.6.0-1: fixed in 1:68.6.0-1
—
Debian:8(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr45.0.1esr-1 ... 68.5.0esr-1~deb9u1 (179 versions)
  • every version up to 68.6.0esr-1~deb8u1: fixed in 68.6.0esr-1~deb8u1
—
thunderbird1.5-4 ... 1:68.5.0-1~deb9u1 (118 versions)
  • every version up to 1:68.6.0-1~deb8u1: fixed in 1:68.6.0-1~deb8u1
—
Debian:9(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr45.9.0esr-1 ... 68.6.0esr-1~deb8u1 (142 versions)
  • every version up to 68.6.0esr-1~deb9u1: fixed in 68.6.0esr-1~deb9u1
—
thunderbird1.5-4 ... 1:68.6.0-1~deb8u1 (119 versions)
  • every version up to 1:68.6.0-1~deb9u1: fixed in 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 / 26× 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 168 total refreshes for this CVE.

  1. 2026-10-05 17:40 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
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  7. 2026-09-30 15:22 UTCEG score recompute
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  16. 2026-09-19 18:00 UTCOSV refresh
  17. 2026-09-19 15:37 UTCEPSS rescore
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  24. 2026-09-08 21:56 UTCEPSS rescore
  25. 2026-09-07 15:58 UTCEPSS rescore
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  1. 2026-09-06 13:44 UTCEPSS rescore
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  3. 2026-09-04 13:57 UTCEPSS rescore
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  6. 2026-09-02 14:08 UTCEPSS rescore
  7. 2026-09-01 03:32 UTCEPSS rescore
  8. 2026-08-31 21:04 UTCOSV refresh
  9. 2026-08-30 19:14 UTCEPSS rescore
  10. 2026-08-30 01:19 UTCEPSS rescore
  11. 2026-08-28 21:37 UTCEPSS rescore
  12. 2026-08-27 14:21 UTCEPSS rescore
  13. 2026-08-26 14:42 UTCEPSS rescore
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  21. 2026-08-15 01:27 UTCEPSS rescore
  22. 2026-08-14 23:24 UTCOSV refresh
  23. 2026-08-13 21:57 UTCEPSS rescore
  24. 2026-08-12 13:47 UTCEPSS rescore
  25. 2026-08-09 13:43 UTCEPSS rescore
  26. 2026-08-08 16:33 UTCEPSS rescore
  27. 2026-08-07 16:23 UTCEPSS rescore
  28. 2026-08-06 13:43 UTCEPSS rescore
  29. 2026-08-05 19:14 UTCEPSS rescore
  30. 2026-08-04 15:06 UTCEPSS rescore
  31. 2026-08-04 10:34 UTCEPSS rescore
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  34. 2026-07-30 16:25 UTCEPSS rescore
  35. 2026-07-30 11:44 UTCOSV refresh
  36. 2026-07-30 01:27 UTCEPSS rescore
  37. 2026-07-28 15:33 UTCEPSS rescore
  38. 2026-07-26 14:52 UTCEPSS rescore
  39. 2026-07-25 14:15 UTCEPSS rescore
  40. 2026-07-24 14:15 UTCEPSS rescore
  41. 2026-07-23 14:15 UTCEPSS rescore
  42. 2026-07-23 01:54 UTCEG score recompute
  43. 2026-07-22 22:40 UTCEG score recompute
  44. 2026-07-22 14:05 UTCEPSS rescore
  45. 2026-07-21 15:22 UTCEPSS rescore
  46. 2026-07-21 15:22 UTCEPSS rescore
  47. 2026-07-20 17:04 UTCEPSS rescore
  48. 2026-07-20 17:04 UTCEPSS rescore
  49. 2026-07-19 02:26 UTCEPSS rescore
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  51. 2026-07-18 10:02 UTCEPSS rescore
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  55. 2026-07-15 01:57 UTCEPSS rescore
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  58. 2026-07-13 06:10 UTCEPSS rescore
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  60. 2026-07-12 21:07 UTCOSV refresh
  61. 2026-07-12 05:44 UTCEPSS rescore
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  63. 2026-07-11 08:25 UTCEPSS rescore
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  65. 2026-07-09 19:07 UTCEPSS rescore
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  75. 2026-07-02 16:57 UTCEPSS rescore

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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 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 1.5% probability of exploitation in the next 30 days (73rd percentile of EPSS-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?
A fix for CVE-2020-6805 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2020-6805 are linked in the Vendor Advisories panel on this page.

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