CVE-2017-9544

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 24%CVSS: 9.8Exploit: NoneExposed: 0

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

There is a remote stack-based buffer overflow (SEH) in register.ghp in EFS Software Easy Chat Server versions 2.0 to 3.1. By sending an overly long username string to registresult.htm for registering the user, an attacker may be able to execute arbitrary code.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
97.6%
KEV
Not listed

Published

June 12, 2017

Last Modified

May 13, 2026

Advisory Details (1)

Auto-updated Jun 21, 2026
No patch confirmed yet.
generic🟡 PoC Available

EFS Easy Chat Server 3.1 - Remote Buffer Overflow (SEH) - Windows remote Exploit

https://www.exploit-db.com/exploits/42155/

Data Freshness Timeline

(refreshed 10× in last 7d / 36× 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. 2026-07-07 13:42 UTCEPSS rescore
  2. 2026-07-06 02:20 UTCEPSS rescore
  3. 2026-07-06 02:20 UTCEPSS rescore
  4. 2026-07-05 02:27 UTCEPSS rescore
  5. 2026-07-04 06:28 UTCEPSS rescore
  6. 2026-07-04 06:28 UTCEPSS rescore
  7. 2026-07-02 16:54 UTCEPSS rescore
  8. 2026-07-01 15:03 UTCEPSS rescore
  9. 2026-06-30 23:19 UTCEPSS rescore
  10. 2026-06-30 23:19 UTCEPSS rescore
  11. 2026-06-29 14:03 UTCEPSS rescore
  12. 2026-06-28 14:04 UTCEPSS rescore
  13. 2026-06-28 04:53 UTCEPSS rescore
  14. 2026-06-28 04:53 UTCEPSS rescore
  15. 2026-06-27 03:06 UTCEPSS rescore
  16. 2026-06-25 13:47 UTCEPSS rescore
  17. 2026-06-24 14:02 UTCEPSS rescore
  18. 2026-06-24 14:02 UTCEPSS rescore
  19. 2026-06-23 21:30 UTCEPSS rescore
  20. 2026-06-23 21:30 UTCEPSS rescore
  21. 2026-06-22 14:23 UTCEPSS rescore
  22. 2026-06-22 14:23 UTCEPSS rescore
  23. 2026-06-21 01:57 UTCEPSS rescore
  24. 2026-06-21 01:57 UTCEPSS rescore
  25. 2026-06-18 17:50 UTCEPSS rescore
Show 54 more
  1. 2026-06-17 17:50 UTCEPSS rescore
  2. 2026-06-16 17:50 UTCEPSS rescore
  3. 2026-06-15 17:45 UTCEPSS rescore
  4. 2026-06-12 23:09 UTCEPSS rescore
  5. 2026-06-12 23:09 UTCEPSS rescore
  6. 2026-06-10 22:15 UTCEPSS rescore
  7. 2026-06-10 13:19 UTCEPSS rescore
  8. 2026-06-08 14:14 UTCEPSS rescore
  9. 2026-06-08 14:14 UTCEPSS rescore
  10. 2026-06-07 15:22 UTCEPSS rescore
  11. 2026-06-07 15:22 UTCEPSS rescore
  12. 2026-06-06 13:45 UTCEPSS rescore
  13. 2026-06-06 13:45 UTCEPSS rescore
  14. 2026-06-05 22:44 UTCEPSS rescore
  15. 2026-06-05 22:44 UTCEPSS rescore
  16. 2026-06-05 06:08 UTCEPSS rescore
  17. 2026-06-05 06:08 UTCEPSS rescore
  18. 2026-06-01 13:49 UTCEPSS rescore
  19. 2026-06-01 13:49 UTCEPSS rescore
  20. 2026-05-31 00:14 UTCEPSS rescore
  21. 2026-05-31 00:14 UTCEPSS rescore
  22. 2026-05-29 13:41 UTCEPSS rescore
  23. 2026-05-27 13:38 UTCEPSS rescore
  24. 2026-05-27 13:38 UTCEPSS rescore
  25. 2026-05-26 13:42 UTCEPSS rescore
  26. 2026-05-26 07:17 UTCEPSS rescore
  27. 2026-05-26 07:17 UTCEPSS rescore
  28. 2026-05-22 21:15 UTCEPSS rescore
  29. 2026-05-22 21:15 UTCEPSS rescore
  30. 2026-05-22 21:15 UTCEPSS rescore
  31. 2026-05-22 21:15 UTCEPSS rescore
  32. 2026-05-22 21:15 UTCEPSS rescore
  33. 2026-05-22 21:15 UTCEPSS rescore
  34. 2026-05-22 21:15 UTCEPSS rescore
  35. 2026-05-20 08:56 UTCEG score recompute
  36. 2026-05-20 08:56 UTCGHSA enrichment
  37. 2026-05-20 04:49 UTCEG score recompute
  38. 2026-05-20 04:49 UTCGHSA enrichment
  39. 2026-05-20 00:42 UTCEG score recompute
  40. 2026-05-20 00:42 UTCGHSA enrichment
  41. 2026-05-19 20:33 UTCEG score recompute
  42. 2026-05-19 20:33 UTCGHSA enrichment
  43. 2026-05-19 16:26 UTCEG score recompute
  44. 2026-05-19 16:26 UTCGHSA enrichment
  45. 2026-05-19 12:18 UTCEG score recompute
  46. 2026-05-19 12:18 UTCGHSA enrichment
  47. 2026-05-19 08:10 UTCEG score recompute
  48. 2026-05-19 08:10 UTCGHSA enrichment
  49. 2026-05-19 04:03 UTCEG score recompute
  50. 2026-05-19 04:03 UTCGHSA enrichment
  51. 2026-05-18 23:54 UTCEG score recompute
  52. 2026-05-18 21:30 UTCEPSS rescore
  53. 2026-05-18 21:30 UTCEPSS rescore
  54. 2026-05-18 21:30 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/http/easychatserver_seh✓ verified
    First seen Oct 9, 2017

    Easy Chat Server User Registeration Buffer Overflow (SEH)

    Open source ↗

Frequently asked(5)

What is CVE-2017-9544?
CVE-2017-9544 is a critical vulnerability published on June 12, 2017. There is a remote stack-based buffer overflow (SEH) in register.ghp in EFS Software Easy Chat Server versions 2.0 to 3.1. By sending an overly long username string to registresult.htm for registering the user, an attacker may be able to execute arbitrary code.
When was CVE-2017-9544 disclosed?
CVE-2017-9544 was first published in the National Vulnerability Database on June 12, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-9544 actively exploited?
CVE-2017-9544 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 97.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-9544?
CVE-2017-9544 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-9544?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-9544, 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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