CVE-2020-37248

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH 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
Trending — 3 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
6.5(high)
EPSS
8.3%
KEV
Not listed

Published

June 8, 2026

Last Modified

June 9, 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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 93× 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.

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

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 in the National Vulnerability Database on June 8, 2026, with the most recent update on June 9, 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 8.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-37248?
CVE-2020-37248 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2020-37248?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-37248, 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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