CVE-2026-70637

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory (severity: HIGH) published 2026-08-06. A secondary CVSS source baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.9Exploit: Elevated riskExposed services: Not assessed

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

LightFTP through 2.4 contains multiple data race vulnerabilities in ftpserv.c that allow anonymous attackers to cause undefined behavior by issuing LIST followed by ABOR commands without authentication. The control thread closes data_socket and file_fd descriptors while worker threads concurrently operate on the same fields in worker_thread_cleanup, allowing stale file descriptors to be reassigned by the OS and subsequently used by worker threads on unrelated resources, resulting in potential denial of service.

CVSS v3
5.9
EG Score
5.9MEDIUMmedium confidence
EG Risk
43
EG Risk 43/100CISA 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
Severity59% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (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

August 6, 2026

Last Modified

September 24, 2026

Advisory Details (2)

Auto-updated Aug 6, 2026
No fix on record yet.
generic

LightFTP 2.4 Data Race Condition via ABOR Command in ftpserv.c | Advisories | VulnCheck

https://www.vulncheck.com/advisories/lightftp-data-race-condition-via-abor-command-in-ftpserv-c
generic

[SECURITY] LightFTP: concurrent fd close race — worker_thread_cleanup vs transfer worker thread · Issue #75 · hfiref0x/LightFTP · GitHub

https://github.com/hfiref0x/LightFTP/issues/75

Vendor Advisories for CVE-2026-70637(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 13× in last 7d / 67× 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 160 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-70637?
CVE-2026-70637 is a medium vulnerability published on August 6, 2026. LightFTP through 2.4 contains multiple data race vulnerabilities in ftpserv.c that allow anonymous attackers to cause undefined behavior by issuing LIST followed by ABOR commands without authentication. The control thread closes datasocket and filefd descriptors while worker threads concurrently…
When was CVE-2026-70637 disclosed?
CVE-2026-70637 was first published on August 6, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70637 actively exploited?
CVE-2026-70637 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-70637?
CVE-2026-70637 has a CVSS base score of 5.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-70637?
No fix for CVE-2026-70637 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-70637 are linked in the Vendor Advisories panel on this page.

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