CVE-2020-37248

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-06-08. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

OfflineIMAP before 8.0.3 trusts the server with their STARTTLS capability prior to authentication, which allows STRIPTLS/man-in-the-middle attacks, taking over the connection and extracting account credentials in cleartext.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100CISA 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). 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

June 8, 2026

Last Modified

July 23, 2026

Advisory Details (5)

Auto-updated Jun 12, 2026
Patch available. Sources: github_commit.
generic

oss-security - offlineimap 8.0.3 fixes CVE-2020-37248 (STARTTLS stripping)

http://www.openwall.com/lists/oss-security/2026/06/08/3
generic

offlineimap · PyPI

https://pypi.org/project/offlineimap/#history
generic

[security] Passwords may be sent in plaintext despite user configuration asking for use of `STARTTLS` · Issue #222 · OfflineIMAP/offlineimap3 · GitHub

https://github.com/OfflineIMAP/offlineimap3/issues/222
github_commit Patch Available

commit 46505c53ef99 (OfflineIMAP/offlineimap3)

Patch available: OfflineIMAP/offlineimap3 v8.0.3 (contains commit 46505c53ef99)

https://github.com/OfflineIMAP/offlineimap3/commit/46505c53ef995455d66c685f9ec3ff6ea93dbb74
generic

No enforcement of STARTTLS. · Issue #669 · OfflineIMAP/offlineimap · GitHub

https://github.com/OfflineIMAP/offlineimap/issues/669

Vendor Advisories for CVE-2020-37248(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
offlineimap30.0~git20210225.1e7ef9e+dfsg-4 ... 8.0.3+dfsg-2 (17 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
offlineimap30.0~git20211018.e64c254+dfsg-2 ... 8.0.3+dfsg-2 (13 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
offlineimap30.0~git20240826.db34745+dfsg-2, 8.0.2+dfsg-1, 8.0.2+dfsg-2~exp1, 8.0.3+dfsg-1, 8.0.3+dfsg-2
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
offlineimap30.0~git20240826.db34745+dfsg-2, 8.0.2+dfsg-1, 8.0.2+dfsg-2~exp1
  • every version up to 8.0.3+dfsg-1: fixed in 8.0.3+dfsg-1
—

Weakness Classification(1)

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

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 214 total refreshes for this CVE.

  1. 2026-10-09 20:04 UTCEPSS rescore
  2. 2026-10-08 16:38 UTCEPSS rescore
  3. 2026-10-07 23:44 UTCEPSS rescore
  4. 2026-10-06 15:13 UTCEPSS rescore
  5. 2026-10-05 17:39 UTCEPSS rescore
  6. 2026-10-04 23:18 UTCEPSS rescore
  7. 2026-10-03 14:22 UTCEPSS rescore
  8. 2026-10-03 10:39 UTCOSV refresh
  9. 2026-09-30 15:19 UTCEG score recompute
  10. 2026-09-30 14:59 UTCEPSS rescore
  11. 2026-09-29 15:14 UTCEPSS rescore
  12. 2026-09-27 13:41 UTCEPSS rescore
  13. 2026-09-26 15:54 UTCEPSS rescore
  14. 2026-09-26 15:54 UTCEPSS rescore
  15. 2026-09-24 14:00 UTCEPSS rescore
  16. 2026-09-22 14:43 UTCEPSS rescore
  17. 2026-09-21 20:28 UTCEPSS rescore
  18. 2026-09-20 20:11 UTCEPSS rescore
  19. 2026-09-19 15:37 UTCEPSS rescore
  20. 2026-09-18 19:23 UTCEPSS rescore
  21. 2026-09-17 19:22 UTCEPSS rescore
  22. 2026-09-16 14:04 UTCEPSS rescore
  23. 2026-09-15 03:06 UTCEPSS rescore
  24. 2026-09-14 04:54 UTCEG score recompute
  25. 2026-09-14 04:54 UTCGHSA enrichment
Show 75 more
  1. 2026-09-13 16:43 UTCEPSS rescore
  2. 2026-09-12 14:57 UTCEPSS rescore
  3. 2026-09-11 09:32 UTCEPSS rescore
  4. 2026-09-07 15:57 UTCEPSS rescore
  5. 2026-09-06 13:44 UTCEPSS rescore
  6. 2026-09-05 15:24 UTCEPSS rescore
  7. 2026-09-04 13:57 UTCEPSS rescore
  8. 2026-09-04 05:03 UTCEPSS rescore
  9. 2026-09-02 14:08 UTCEPSS rescore
  10. 2026-09-01 03:32 UTCEPSS rescore
  11. 2026-08-31 02:13 UTCEG score recompute
  12. 2026-08-31 02:13 UTCGHSA enrichment
  13. 2026-08-30 19:14 UTCEPSS rescore
  14. 2026-08-30 01:18 UTCEPSS rescore
  15. 2026-08-27 14:21 UTCEPSS rescore
  16. 2026-08-26 14:42 UTCEPSS rescore
  17. 2026-08-25 13:45 UTCEPSS rescore
  18. 2026-08-25 01:33 UTCEG score recompute
  19. 2026-08-25 01:33 UTCGHSA enrichment
  20. 2026-08-23 11:52 UTCEG score recompute
  21. 2026-08-23 11:52 UTCGHSA enrichment
  22. 2026-08-21 23:45 UTCEPSS rescore
  23. 2026-08-21 08:21 UTCEG score recompute
  24. 2026-08-21 08:21 UTCGHSA enrichment
  25. 2026-08-20 22:52 UTCEPSS rescore
  26. 2026-08-20 09:32 UTCEG score recompute
  27. 2026-08-20 09:32 UTCGHSA enrichment
  28. 2026-08-19 17:00 UTCEPSS rescore
  29. 2026-08-18 13:44 UTCEPSS rescore
  30. 2026-08-17 13:43 UTCEPSS rescore
  31. 2026-08-17 09:29 UTCEG score recompute
  32. 2026-08-17 09:29 UTCGHSA enrichment
  33. 2026-08-16 14:52 UTCEPSS rescore
  34. 2026-08-16 10:45 UTCEG score recompute
  35. 2026-08-16 10:45 UTCGHSA enrichment
  36. 2026-08-16 02:11 UTCEPSS rescore
  37. 2026-08-15 12:02 UTCEG score recompute
  38. 2026-08-15 12:02 UTCGHSA enrichment
  39. 2026-08-15 01:26 UTCEPSS rescore
  40. 2026-08-14 09:04 UTCEG score recompute
  41. 2026-08-14 09:04 UTCGHSA enrichment
  42. 2026-08-13 21:57 UTCEPSS rescore
  43. 2026-08-13 10:20 UTCEG score recompute
  44. 2026-08-13 10:20 UTCGHSA enrichment
  45. 2026-08-12 13:47 UTCEPSS rescore
  46. 2026-08-12 11:36 UTCEG score recompute
  47. 2026-08-12 11:36 UTCGHSA enrichment
  48. 2026-08-11 12:51 UTCEG score recompute
  49. 2026-08-11 12:51 UTCGHSA enrichment
  50. 2026-08-10 13:58 UTCGHSA enrichment
  51. 2026-08-09 15:13 UTCEG score recompute
  52. 2026-08-09 15:13 UTCGHSA enrichment
  53. 2026-08-09 13:43 UTCEPSS rescore
  54. 2026-08-08 16:33 UTCEPSS rescore
  55. 2026-08-08 16:29 UTCGHSA enrichment
  56. 2026-08-07 17:45 UTCEG score recompute
  57. 2026-08-07 17:45 UTCGHSA enrichment
  58. 2026-08-07 16:23 UTCEPSS rescore
  59. 2026-08-06 19:01 UTCEG score recompute
  60. 2026-08-06 19:01 UTCGHSA enrichment
  61. 2026-08-06 13:43 UTCEPSS rescore
  62. 2026-08-05 20:17 UTCEG score recompute
  63. 2026-08-05 20:17 UTCGHSA enrichment
  64. 2026-08-04 16:23 UTCEG score recompute
  65. 2026-08-04 16:23 UTCGHSA enrichment
  66. 2026-08-04 15:06 UTCEPSS rescore
  67. 2026-08-04 10:34 UTCEPSS rescore
  68. 2026-08-03 15:22 UTCEG score recompute
  69. 2026-08-03 15:22 UTCGHSA enrichment
  70. 2026-08-02 09:37 UTCEG score recompute
  71. 2026-08-02 09:37 UTCGHSA enrichment
  72. 2026-08-02 02:23 UTCEPSS rescore
  73. 2026-08-01 10:53 UTCEG score recompute
  74. 2026-08-01 10:53 UTCGHSA enrichment
  75. 2026-08-01 04:12 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2020-37248?
CVE-2020-37248 is a medium vulnerability published on June 8, 2026. OfflineIMAP before 8.0.3 trusts the server with their STARTTLS capability prior to authentication, which allows STRIPTLS/man-in-the-middle attacks, taking over the connection and extracting account credentials in cleartext.
When was CVE-2020-37248 disclosed?
CVE-2020-37248 was first published on June 8, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-37248 actively exploited?
CVE-2020-37248 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-37248?
CVE-2020-37248 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2020-37248?
A fix for CVE-2020-37248 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2020-37248 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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