CVE-2006-6171

NONECVSS 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 10%CVSS: —Exploit: NoneExposed: 0

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

ProFTPD 1.3.0a and earlier does not properly set the buffer size limit when CommandBufferSize is specified in the configuration file, which leads to an off-by-two buffer underflow. NOTE: in November 2006, the role of CommandBufferSize was originally associated with CVE-2006-5815, but this was an error stemming from a vague initial disclosure. NOTE: ProFTPD developers dispute this issue, saying that the relevant memory location is overwritten by assignment before further use within the affected function, so this is not a vulnerability

CVSS v3
—
EG Score
0.0(none)
EPSS
94.9%
KEV
Not listed

Published

November 30, 2006

Last Modified

April 23, 2026

References (28)

Data Freshness Timeline

(refreshed 3× in last 7d / 33× 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. 2026-07-13 22:25 UTCEPSS rescore
  2. 2026-07-08 18:09 UTCOSV refresh
  3. 2026-07-08 15:09 UTCEPSS rescore
  4. 2026-07-06 02:19 UTCEPSS rescore
  5. 2026-07-06 02:19 UTCEPSS rescore
  6. 2026-07-05 02:26 UTCEPSS rescore
  7. 2026-07-04 06:27 UTCEPSS rescore
  8. 2026-07-04 06:26 UTCEPSS rescore
  9. 2026-07-02 14:00 UTCEPSS rescore
  10. 2026-07-01 15:02 UTCEPSS rescore
  11. 2026-07-01 15:02 UTCEPSS rescore
  12. 2026-06-30 23:18 UTCEPSS rescore
  13. 2026-06-29 14:02 UTCEPSS rescore
  14. 2026-06-29 14:02 UTCEPSS rescore
  15. 2026-06-28 14:02 UTCEPSS rescore
  16. 2026-06-28 04:52 UTCEPSS rescore
  17. 2026-06-25 13:46 UTCEPSS rescore
  18. 2026-06-25 13:46 UTCEPSS rescore
  19. 2026-06-24 14:02 UTCEPSS rescore
  20. 2026-06-24 14:01 UTCEPSS rescore
  21. 2026-06-23 21:29 UTCEPSS rescore
  22. 2026-06-23 21:29 UTCEPSS rescore
  23. 2026-06-20 05:42 UTCOSV refresh
  24. 2026-06-19 19:22 UTCEPSS rescore
  25. 2026-06-19 19:22 UTCEPSS rescore
Show 52 more
  1. 2026-06-18 17:49 UTCEPSS rescore
  2. 2026-06-18 17:49 UTCEPSS rescore
  3. 2026-06-17 17:49 UTCEPSS rescore
  4. 2026-06-17 17:49 UTCEPSS rescore
  5. 2026-06-16 17:49 UTCEPSS rescore
  6. 2026-06-16 17:49 UTCEPSS rescore
  7. 2026-06-15 17:44 UTCEPSS rescore
  8. 2026-06-14 23:13 UTCEPSS rescore
  9. 2026-06-13 22:57 UTCEPSS rescore
  10. 2026-06-13 22:57 UTCEPSS rescore
  11. 2026-06-12 23:08 UTCEPSS rescore
  12. 2026-06-08 14:13 UTCEPSS rescore
  13. 2026-06-07 15:21 UTCEPSS rescore
  14. 2026-06-07 15:21 UTCEPSS rescore
  15. 2026-06-06 13:44 UTCEPSS rescore
  16. 2026-06-06 13:44 UTCEPSS rescore
  17. 2026-06-05 22:44 UTCEPSS rescore
  18. 2026-06-05 22:44 UTCEPSS rescore
  19. 2026-06-05 06:07 UTCEPSS rescore
  20. 2026-06-04 13:09 UTCEPSS rescore
  21. 2026-06-04 13:09 UTCEPSS rescore
  22. 2026-06-02 20:10 UTCEPSS rescore
  23. 2026-06-02 20:10 UTCEPSS rescore
  24. 2026-06-01 13:49 UTCEPSS rescore
  25. 2026-06-01 13:49 UTCEPSS rescore
  26. 2026-05-31 22:28 UTCEPSS rescore
  27. 2026-05-31 22:28 UTCEPSS rescore
  28. 2026-05-31 05:40 UTCEG score recompute
  29. 2026-05-31 05:40 UTCGHSA enrichment
  30. 2026-05-31 00:13 UTCEPSS rescore
  31. 2026-05-31 00:13 UTCEPSS rescore
  32. 2026-05-29 13:40 UTCEPSS rescore
  33. 2026-05-28 13:42 UTCEPSS rescore
  34. 2026-05-28 13:42 UTCEPSS rescore
  35. 2026-05-27 13:37 UTCEPSS rescore
  36. 2026-05-27 13:37 UTCEPSS rescore
  37. 2026-05-26 13:41 UTCEPSS rescore
  38. 2026-05-26 13:41 UTCEPSS rescore
  39. 2026-05-26 07:16 UTCEPSS rescore
  40. 2026-05-26 07:16 UTCEPSS rescore
  41. 2026-05-26 07:16 UTCEPSS rescore
  42. 2026-05-24 16:42 UTCEPSS rescore
  43. 2026-05-22 21:15 UTCEPSS rescore
  44. 2026-05-22 21:15 UTCEPSS rescore
  45. 2026-05-22 21:15 UTCEPSS rescore
  46. 2026-05-21 22:38 UTCEPSS rescore
  47. 2026-05-20 23:36 UTCOSV refresh
  48. 2026-05-20 22:36 UTCEPSS rescore
  49. 2026-05-20 11:20 UTCEPSS rescore
  50. 2026-05-20 11:20 UTCEPSS rescore
  51. 2026-05-18 21:29 UTCEPSS rescore
  52. 2026-05-18 21:29 UTCEPSS rescore

Frequently asked(4)

What is CVE-2006-6171?
CVE-2006-6171 is a none vulnerability published on November 30, 2006. ProFTPD 1.3.0a and earlier does not properly set the buffer size limit when CommandBufferSize is specified in the configuration file, which leads to an off-by-two buffer underflow. NOTE: in November 2006, the role of CommandBufferSize was originally associated with CVE-2006-5815, but this was an…
When was CVE-2006-6171 disclosed?
CVE-2006-6171 was first published in the National Vulnerability Database on November 30, 2006, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2006-6171 actively exploited?
CVE-2006-6171 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 94.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2006-6171?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2006-6171, 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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