CVE-2025-15638

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-21. NVD baseline CVSS 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 10.0Exploit: None knownExposed: 0

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

Net::Dropbear versions before 0.14 for Perl contains a vulnerable version of libtomcrypt.

Net::Dropbear versions before 0.14 includes versions of Dropbear 2019.78 or earlier. These include versions of libtomcrypt v1.18.1 or earlier, which is affected by CVE-2016-6129 and CVE-2018-12437.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity100% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

April 21, 2026

Last Modified

April 22, 2026

Advisory Details (3)

Auto-updated Sep 12, 2026
No patch confirmed yet.
generic
https://www.cve.org/CVERecord?id=CVE-2018-12437
generic
https://www.cve.org/CVERecord?id=CVE-2016-6129
generic

Client Challenge

https://metacpan.org/release/ATRODO/Net-Dropbear-0.14/source/dropbear/libtomcrypt/changes

Data Freshness Timeline

(refreshed 7× in last 7d / 30× 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 273 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2025-15638?
CVE-2025-15638 is a critical vulnerability published on April 21, 2026. Net::Dropbear versions before 0.14 for Perl contains a vulnerable version of libtomcrypt. Net::Dropbear versions before 0.14 includes versions of Dropbear 2019.78 or earlier. These include versions of libtomcrypt v1.18.1 or earlier, which is affected by CVE-2016-6129 and CVE-2018-12437.
When was CVE-2025-15638 disclosed?
CVE-2025-15638 was first published in the National Vulnerability Database on April 21, 2026, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-15638 actively exploited?
CVE-2025-15638 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 54.6% of all scored CVEs.
What is the CVSS score of CVE-2025-15638?
CVE-2025-15638 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2025-15638?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-15638, 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.

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