CVE-2020-15685

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-12-22. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
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: Elevated riskExposed: 0

A fix is available — apply it.

During the plaintext phase of the STARTTLS connection setup, protocol commands could have been injected and evaluated within the encrypted session. This vulnerability affects Thunderbird < 78.7.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

December 22, 2022

Last Modified

April 16, 2025

Advisory Details (2)

Auto-updated Aug 9, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 78.7 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2021-05/
generic

1622640 - (CVE-2020-15685) IMAP Response Injection when using STARTTLS

https://bugzilla.mozilla.org/show_bug.cgi?id=1622640

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxul-ext-lightning (1:78.7.1+build1-0ubuntu0.20.10.4) @ groovy2026-05-25ubuntu
redhatthunderbird-0:78.7.0-1.el8_12021-02-03redhat
redhatthunderbird-0:78.7.0-1.el7_92021-01-28redhat
redhatthunderbird-0:78.7.0-1.el8_32021-01-28redhat
redhatthunderbird-0:78.7.0-1.el8_22021-01-28redhat

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

(6 across 6 ecosystems)
Debian:10(1)
PackageVulnerable rangeFixed inDependents
thunderbird1:60.7.2-1 ... 1:78.7.0-1~deb9u1 (105 versions)1:78.7.0-1~deb10u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
thunderbird—1:78.7.0-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
thunderbird—1:78.7.0-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
thunderbird—1:78.7.0-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
thunderbird—1:78.7.0-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
thunderbird1.5-4 ... 1:78.6.1-1 (186 versions)1:78.7.0-1~deb9u1—

Weakness Classification(1)

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

All Vendor Advisories

(5)

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 8× 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 146 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2020-15685?
CVE-2020-15685 is a high vulnerability published on December 22, 2022. During the plaintext phase of the STARTTLS connection setup, protocol commands could have been injected and evaluated within the encrypted session. This vulnerability affects Thunderbird < 78.7.
When was CVE-2020-15685 disclosed?
CVE-2020-15685 was first published in the National Vulnerability Database on December 22, 2022, with the most recent update on April 16, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-15685 actively exploited?
CVE-2020-15685 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 44.2% of all scored CVEs.
What is the CVSS score of CVE-2020-15685?
CVE-2020-15685 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2020-15685?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-15685, 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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