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
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 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(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

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

(3 across 3 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
offlineimap30.0~git20210225.1e7ef9e+dfsg-4 ... 8.0.3+dfsg-2 (17 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
offlineimap30.0~git20211018.e64c254+dfsg-2 ... 8.0.3+dfsg-2 (13 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
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——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 70× 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 173 total refreshes for this CVE.

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

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 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% probability of exploitation in the next 30 days, which ranks it in the top 91.9% of all scored CVEs.
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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