CVE-2009-20004

HIGHNVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under NVD CVSS v3. EPSS exploit probability: 4.2%, top 11% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Weaponized
8.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.4Exploit: NoneExposed: 0

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

gAlan 0.2.1, a modular audio processing environment for Windows, is vulnerable to a stack-based buffer overflow when parsing .galan files. The application fails to properly validate the length of input data, allowing a specially crafted file to overwrite the stack and execute arbitrary code. Exploitation requires local interaction, typically by convincing a user to open the malicious file.

CVSS v3
8.4
EG Score
8.4(medium)
EPSS
26.9%
KEV
Not listed

Published

August 21, 2025

Last Modified

April 15, 2026

Advisory Details (7)

Auto-updated Jul 13, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

gAlan - '.galan' Universal Buffer Overflow - Windows local Exploit

https://www.exploit-db.com/exploits/10345
generic🟡 PoC Available

gAlan 0.2.1 - Local Buffer Overflow (1) - Windows local Exploit

https://www.exploit-db.com/exploits/10339
generic
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/fileformat/galan_fileformat_bof.rb
generic

gAlan <= 0.2.1 Buffer Overflow | Advisories | VulnCheck

https://www.vulncheck.com/advisories/galan-buffer-overflow
generic

Just a moment

https://www.fortiguard.com/encyclopedia/ips/18034/galan-galan-file-stack-overflow
generic🟡 PoC Available

gAlan 0.2.1 - Local Buffer Overflow (Metasploit) (2) - Windows local Exploit

https://www.exploit-db.com/exploits/16664
generic

gAlan - The Graphical Audio Language

https://web.archive.org/web/20101210055252/http://galan.sourceforge.net/

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 34× 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. 2026-07-22 14:03 UTCEPSS rescore
  2. 2026-07-20 17:03 UTCEPSS rescore
  3. 2026-07-20 17:03 UTCEPSS rescore
  4. 2026-07-18 09:59 UTCEPSS rescore
  5. 2026-07-16 16:58 UTCEPSS rescore
  6. 2026-07-15 16:54 UTCEPSS rescore
  7. 2026-07-15 16:54 UTCEPSS rescore
  8. 2026-07-15 01:55 UTCEPSS rescore
  9. 2026-07-13 22:25 UTCEPSS rescore
  10. 2026-07-13 06:07 UTCEPSS rescore
  11. 2026-07-11 08:22 UTCEPSS rescore
  12. 2026-07-11 08:22 UTCEPSS rescore
  13. 2026-07-09 19:04 UTCEPSS rescore
  14. 2026-07-08 15:10 UTCEPSS rescore
  15. 2026-07-06 16:23 UTCEPSS rescore
  16. 2026-07-06 02:19 UTCEPSS rescore
  17. 2026-07-06 02:19 UTCEPSS rescore
  18. 2026-07-05 02:26 UTCEPSS rescore
  19. 2026-07-05 02:26 UTCEPSS rescore
  20. 2026-07-04 06:27 UTCEPSS rescore
  21. 2026-07-01 15:02 UTCEPSS rescore
  22. 2026-06-30 23:19 UTCEPSS rescore
  23. 2026-06-29 14:02 UTCEPSS rescore
  24. 2026-06-29 14:02 UTCEPSS rescore
  25. 2026-06-28 14:03 UTCEPSS rescore
Show 68 more
  1. 2026-06-28 04:52 UTCEPSS rescore
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  3. 2026-06-27 03:05 UTCEPSS rescore
  4. 2026-06-25 13:46 UTCEPSS rescore
  5. 2026-06-25 13:46 UTCEPSS rescore
  6. 2026-06-24 14:02 UTCEPSS rescore
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  8. 2026-06-23 21:29 UTCEPSS rescore
  9. 2026-06-23 21:29 UTCEPSS rescore
  10. 2026-06-22 14:22 UTCEPSS rescore
  11. 2026-06-22 14:22 UTCEPSS rescore
  12. 2026-06-21 14:53 UTCEPSS rescore
  13. 2026-06-21 01:56 UTCEPSS rescore
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  15. 2026-06-19 19:22 UTCEPSS rescore
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  17. 2026-06-18 17:49 UTCEPSS rescore
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  19. 2026-06-17 17:49 UTCEPSS rescore
  20. 2026-06-17 17:49 UTCEPSS rescore
  21. 2026-06-16 17:49 UTCEPSS rescore
  22. 2026-06-16 17:49 UTCEPSS rescore
  23. 2026-06-15 17:44 UTCEPSS rescore
  24. 2026-06-14 23:14 UTCEPSS rescore
  25. 2026-06-14 23:14 UTCEPSS rescore
  26. 2026-06-13 22:57 UTCEPSS rescore
  27. 2026-06-12 23:08 UTCEPSS rescore
  28. 2026-06-12 23:08 UTCEPSS rescore
  29. 2026-06-10 22:14 UTCEPSS rescore
  30. 2026-06-10 13:17 UTCEPSS rescore
  31. 2026-06-08 15:39 UTCEG score recompute▲ 8.40
  32. 2026-06-08 15:39 UTCGHSA enrichment
  33. 2026-06-07 15:22 UTCEPSS rescore
  34. 2026-06-07 15:22 UTCEPSS rescore
  35. 2026-06-06 13:44 UTCEPSS rescore
  36. 2026-06-06 13:44 UTCEPSS rescore
  37. 2026-06-06 13:44 UTCEPSS rescore
  38. 2026-06-05 22:44 UTCEPSS rescore
  39. 2026-06-05 22:44 UTCEPSS rescore
  40. 2026-06-05 06:07 UTCEPSS rescore
  41. 2026-06-04 13:09 UTCEPSS rescore
  42. 2026-06-04 13:09 UTCEPSS rescore
  43. 2026-06-02 20:10 UTCEPSS rescore
  44. 2026-06-02 20:10 UTCEPSS rescore
  45. 2026-06-01 13:49 UTCEPSS rescore
  46. 2026-06-01 13:49 UTCEPSS rescore
  47. 2026-05-31 22:28 UTCEPSS rescore
  48. 2026-05-31 22:28 UTCEPSS rescore
  49. 2026-05-31 00:13 UTCEPSS rescore
  50. 2026-05-31 00:13 UTCEPSS rescore
  51. 2026-05-29 13:40 UTCEPSS rescore
  52. 2026-05-28 13:42 UTCEPSS rescore
  53. 2026-05-28 13:42 UTCEPSS rescore
  54. 2026-05-28 13:42 UTCEPSS rescore
  55. 2026-05-27 13:38 UTCEPSS rescore
  56. 2026-05-27 13:38 UTCEPSS rescore
  57. 2026-05-26 07:16 UTCEPSS rescore
  58. 2026-05-26 07:16 UTCEPSS rescore
  59. 2026-05-24 16:43 UTCEPSS rescore
  60. 2026-05-22 21:15 UTCEPSS rescore
  61. 2026-05-22 21:15 UTCEPSS rescore
  62. 2026-05-21 09:23 UTCEG score recompute
  63. 2026-05-21 09:22 UTCGHSA enrichment
  64. 2026-05-20 22:37 UTCEPSS rescore
  65. 2026-05-20 22:37 UTCEPSS rescore
  66. 2026-05-20 11:21 UTCEPSS rescore
  67. 2026-05-20 11:20 UTCEPSS rescore
  68. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/windows/fileformat/galan_fileformat_bof✓ verified
    First seen Dec 7, 2009

    gAlan 0.2.1 Buffer Overflow

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2009-20004?
CVE-2009-20004 is a high vulnerability published on August 21, 2025. gAlan 0.2.1, a modular audio processing environment for Windows, is vulnerable to a stack-based buffer overflow when parsing .galan files. The application fails to properly validate the length of input data, allowing a specially crafted file to overwrite the stack and execute arbitrary code.…
When was CVE-2009-20004 disclosed?
CVE-2009-20004 was first published in the National Vulnerability Database on August 21, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-20004 actively exploited?
CVE-2009-20004 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 26.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2009-20004?
CVE-2009-20004 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2009-20004?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-20004, 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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