CVE-2012-10043

CRITICALNVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 73% 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
9.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.3Exploit: NoneExposed: 0

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

A stack-based buffer overflow vulnerability exists in ActFax Server version 4.32, specifically in the "Import Users from File" functionality of the client interface. The application fails to properly validate the length of tab-delimited fields in .exp files, leading to unsafe usage of strcpy() during CSV parsing. An attacker can exploit this vulnerability by crafting a malicious .exp file and importing it using the default character set "ECMA-94 / Latin 1 (ISO 8859)". Successful exploitation may result in arbitrary code execution, leading to full system compromise. User interaction is required to trigger the vulnerability.

CVSS v3
9.3
EG Score
9.3(medium)
EPSS
27.5%
KEV
Not listed

Published

August 8, 2025

Last Modified

April 15, 2026

Advisory Details (5)

Auto-updated Jul 4, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

ActFax Server 4.31 Build 0225 - Local Privilege Escalation - Windows local Exploit

https://www.exploit-db.com/exploits/20915
generic
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/fileformat/actfax_import_users_bof.rb
generic

ActFax 4.32 Client Importer Buffer Overflow | Advisories | VulnCheck

https://www.vulncheck.com/advisories/actfax-client-importer-buffer-overflow
generic

ActFax - Fax and Email Software for Windows and Unix - ActiveFax

https://www.actfax.com/
generic

pwnag3: ActFax Local Privilege Escalation Exploit

https://web.archive.org/web/20130712072809/http://www.pwnag3.com/2012/08/actfax-local-privilege-escalation.html

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 39× 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 105 total refreshes for this CVE.

  1. 2026-07-22 21:49 UTCEG score recompute
  2. 2026-07-22 14:04 UTCEPSS rescore
  3. 2026-07-22 14:04 UTCEPSS rescore
  4. 2026-07-21 15:21 UTCEPSS rescore
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  25. 2026-07-02 14:01 UTCEPSS rescore
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  1. 2026-07-01 15:02 UTCEPSS rescore
  2. 2026-06-30 23:19 UTCEPSS rescore
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  4. 2026-06-29 14:02 UTCEPSS rescore
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  10. 2026-06-25 13:46 UTCEPSS rescore
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  22. 2026-06-18 17:49 UTCEPSS rescore
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  24. 2026-06-17 17:49 UTCEPSS rescore
  25. 2026-06-17 17:49 UTCEPSS rescore
  26. 2026-06-16 17:49 UTCEPSS rescore
  27. 2026-06-16 17:49 UTCEPSS rescore
  28. 2026-06-15 17:44 UTCEPSS rescore
  29. 2026-06-14 23:14 UTCEPSS rescore
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  31. 2026-06-13 22:57 UTCEPSS rescore
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  34. 2026-06-10 22:14 UTCEPSS rescore
  35. 2026-06-10 13:18 UTCEPSS rescore
  36. 2026-06-08 15:48 UTCEG score recompute▲ 9.30
  37. 2026-06-08 15:48 UTCGHSA enrichment
  38. 2026-06-08 14:14 UTCEPSS rescore
  39. 2026-06-08 14:14 UTCEPSS rescore
  40. 2026-06-07 15:22 UTCEPSS rescore
  41. 2026-06-07 15:22 UTCEPSS rescore
  42. 2026-06-06 13:45 UTCEPSS rescore
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  44. 2026-06-05 22:44 UTCEPSS rescore
  45. 2026-06-05 22:44 UTCEPSS rescore
  46. 2026-06-05 06:08 UTCEPSS rescore
  47. 2026-06-05 06:08 UTCEPSS rescore
  48. 2026-06-04 13:09 UTCEPSS rescore
  49. 2026-06-02 20:10 UTCEPSS rescore
  50. 2026-06-02 20:10 UTCEPSS rescore
  51. 2026-06-01 13:49 UTCEPSS rescore
  52. 2026-05-31 22:28 UTCEPSS rescore
  53. 2026-05-31 22:28 UTCEPSS rescore
  54. 2026-05-31 00:14 UTCEPSS rescore
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  56. 2026-05-29 13:41 UTCEPSS rescore
  57. 2026-05-28 13:42 UTCEPSS rescore
  58. 2026-05-28 13:42 UTCEPSS rescore
  59. 2026-05-27 13:38 UTCEPSS rescore
  60. 2026-05-27 13:38 UTCEPSS rescore
  61. 2026-05-26 13:41 UTCEPSS rescore
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  63. 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 21:15 UTCEPSS rescore
  70. 2026-05-21 22:39 UTCEPSS rescore
  71. 2026-05-21 10:12 UTCEG score recompute
  72. 2026-05-21 10:12 UTCGHSA enrichment
  73. 2026-05-20 22:37 UTCEPSS rescore
  74. 2026-05-20 22:37 UTCEPSS rescore
  75. 2026-05-20 22:37 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/actfax_import_users_bof✓ verified
    First seen Aug 28, 2012

    ActiveFax (ActFax) 4.3 Client Importer Buffer Overflow

    Open source ↗

Frequently asked(5)

What is CVE-2012-10043?
CVE-2012-10043 is a critical vulnerability published on August 8, 2025. A stack-based buffer overflow vulnerability exists in ActFax Server version 4.32, specifically in the "Import Users from File" functionality of the client interface. The application fails to properly validate the length of tab-delimited fields in .exp files, leading to unsafe usage of strcpy()…
When was CVE-2012-10043 disclosed?
CVE-2012-10043 was first published in the National Vulnerability Database on August 8, 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-2012-10043 actively exploited?
CVE-2012-10043 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 27.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2012-10043?
CVE-2012-10043 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2012-10043?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2012-10043, 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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