CVE-2009-3727

NONECVSS 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 4%CVSS: —Exploit: NoneExposed: 0

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

Asterisk Open Source 1.2.x before 1.2.35, 1.4.x before 1.4.26.3, 1.6.0.x before 1.6.0.17, and 1.6.1.x before 1.6.1.9; Business Edition A.x.x, B.x.x before B.2.5.12, C.2.x.x before C.2.4.5, and C.3.x.x before C.3.2.2; AsteriskNOW 1.5; and s800i 1.3.x before 1.3.0.5 generate different error messages depending on whether a SIP username is valid, which allows remote attackers to enumerate valid usernames via multiple crafted REGISTER messages with inconsistent usernames in the URI in the To header and the Digest in the Authorization header.

CVSS v3
—
EG Score
0.0(none)
EG Risk
0
EG Risk 0/100

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. It is distinct from the 0–10 EG Score, which measures severity.

EPSS
89.9%
KEV
Not listed

Published

November 10, 2009

Last Modified

April 23, 2026

References (24)

Weakness Classification(1)

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

Data Freshness Timeline

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

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2009-3727?
CVE-2009-3727 is a none vulnerability published on November 10, 2009. Asterisk Open Source 1.2.x before 1.2.35, 1.4.x before 1.4.26.3, 1.6.0.x before 1.6.0.17, and 1.6.1.x before 1.6.1.9; Business Edition A.x.x, B.x.x before B.2.5.12, C.2.x.x before C.2.4.5, and C.3.x.x before C.3.2.2; AsteriskNOW 1.5; and s800i 1.3.x before 1.3.0.5 generate different error messages…
When was CVE-2009-3727 disclosed?
CVE-2009-3727 was first published in the National Vulnerability Database on November 10, 2009, 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-2009-3727 actively exploited?
CVE-2009-3727 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 89.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-3727?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-3727, 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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