CVE-2008-4255

HIGHCVSS v2 · 9.39.3—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 9.3 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:M/Au:N/C:C/I:C/A:C. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 53.7% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Weaponized
9.3EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 54%
  • Public exploit code is available (Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 54%CVSS v2: 9.3Exploit: Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

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

Heap-based buffer overflow in mscomct2.ocx (aka Windows Common ActiveX control or Microsoft Animation ActiveX control) in Microsoft Visual Basic 6.0, Visual Studio .NET 2002 SP1 and 2003 SP1, Visual FoxPro 8.0 SP1 and 9.0 SP1 and SP2, and Office Project 2003 SP3 and 2007 Gold and SP1 allows remote attackers to execute arbitrary code via an AVI file with a crafted stream length, which triggers an "allocation error" and memory corruption, aka "Windows Common AVI Parsing Overflow Vulnerability."

CVSS v2.0 (legacy)
9.3HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
9.3(low)
EG Risk
72(Track)
EG Risk 72/100SSVC: Track

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. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity93% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
54%
EPSS %ILE
99%
KEV
Not listed

Published

December 10, 2008

Last Modified

April 23, 2026

References (22)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 0× in last 7d / 5× 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. 2026-08-15 01:24 UTCEPSS rescore
  2. 2026-08-07 16:21 UTCEPSS rescore
  3. 2026-08-06 13:41 UTCEPSS rescore
  4. 2026-08-05 19:11 UTCEPSS rescore
  5. 2026-07-30 01:25 UTCEPSS rescore
  6. 2026-07-26 13:36 UTCEG score recompute▲ 9.30
  7. 2026-07-25 14:12 UTCEPSS rescore
  8. 2026-07-24 14:12 UTCEPSS rescore
  9. 2026-07-23 00:56 UTCEG score recompute
  10. 2026-07-23 00:35 UTCEG score recompute▼ 3.90
  11. 2026-07-23 00:01 UTCEG score recompute▲ 3.90
  12. 2026-07-22 21:40 UTCEG score recompute
  13. 2026-07-20 17:03 UTCEPSS rescore
  14. 2026-07-16 16:58 UTCEPSS rescore
  15. 2026-07-15 16:54 UTCEPSS rescore
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  17. 2026-07-15 01:55 UTCEPSS rescore
  18. 2026-07-13 22:25 UTCEPSS rescore
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  20. 2026-07-11 08:22 UTCEPSS rescore
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  22. 2026-07-09 19:04 UTCEPSS rescore
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  24. 2026-07-06 16:23 UTCEPSS rescore
  25. 2026-07-06 02:19 UTCEPSS rescore
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  1. 2026-07-06 02:19 UTCEPSS rescore
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  6. 2026-06-28 04:52 UTCEPSS rescore
  7. 2026-06-27 03:04 UTCEPSS rescore
  8. 2026-06-25 13:46 UTCEPSS rescore
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  10. 2026-06-24 14:02 UTCEPSS rescore
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  12. 2026-06-23 21:29 UTCEPSS rescore
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  14. 2026-06-21 14:53 UTCEPSS rescore
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  16. 2026-06-21 01:56 UTCEPSS rescore
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  18. 2026-06-18 17:49 UTCEPSS rescore
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  20. 2026-06-17 17:49 UTCEPSS rescore
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  22. 2026-06-16 17:49 UTCEPSS rescore
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  24. 2026-06-15 17:44 UTCEPSS rescore
  25. 2026-06-14 23:13 UTCEPSS rescore
  26. 2026-06-12 23:08 UTCEPSS rescore
  27. 2026-06-12 23:08 UTCEPSS rescore
  28. 2026-06-11 13:56 UTCEPSS rescore
  29. 2026-06-10 22:14 UTCEPSS rescore
  30. 2026-06-10 13:17 UTCEPSS rescore
  31. 2026-06-07 15:22 UTCEPSS rescore
  32. 2026-06-06 13:44 UTCEPSS rescore
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  34. 2026-06-05 22:44 UTCEPSS rescore
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  36. 2026-06-05 06:07 UTCEPSS rescore
  37. 2026-06-04 13:09 UTCEPSS rescore
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  39. 2026-06-02 20:10 UTCEPSS rescore
  40. 2026-06-02 20:10 UTCEPSS rescore
  41. 2026-06-01 13:49 UTCEPSS rescore
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  43. 2026-06-01 13:49 UTCEPSS rescore
  44. 2026-05-31 00:13 UTCEPSS rescore
  45. 2026-05-31 00:13 UTCEPSS rescore
  46. 2026-05-30 19:12 UTCEG score recompute
  47. 2026-05-30 19:12 UTCGHSA enrichment
  48. 2026-05-29 13:40 UTCEPSS rescore
  49. 2026-05-28 13:42 UTCEPSS rescore
  50. 2026-05-28 13:42 UTCEPSS rescore
  51. 2026-05-28 13:42 UTCEPSS rescore
  52. 2026-05-27 13:38 UTCEPSS rescore
  53. 2026-05-27 13:37 UTCEPSS rescore
  54. 2026-05-26 07:16 UTCEPSS rescore
  55. 2026-05-26 07:16 UTCEPSS rescore
  56. 2026-05-22 21:15 UTCEPSS rescore
  57. 2026-05-22 21:15 UTCEPSS rescore
  58. 2026-05-20 22:37 UTCEPSS rescore
  59. 2026-05-20 22:36 UTCEPSS rescore
  60. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(1 reference)

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

  • Exploit-DBEDB-7431✓ verified
    First seen Dec 12, 2008

    Microsoft Visual Basic - ActiveX Controls mscomct2.ocx Buffer Overflow (PoC)

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2008-4255?
CVE-2008-4255 is a high vulnerability published on December 10, 2008. Heap-based buffer overflow in mscomct2.ocx (aka Windows Common ActiveX control or Microsoft Animation ActiveX control) in Microsoft Visual Basic 6.0, Visual Studio .NET 2002 SP1 and 2003 SP1, Visual FoxPro 8.0 SP1 and 9.0 SP1 and SP2, and Office Project 2003 SP3 and 2007 Gold and SP1 allows remote…
When was CVE-2008-4255 disclosed?
CVE-2008-4255 was first published in the National Vulnerability Database on December 10, 2008, 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-2008-4255 actively exploited?
CVE-2008-4255 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 54% probability of exploitation in the next 30 days, which ranks it in the top 1.1% of all scored CVEs.
How do I remediate CVE-2008-4255?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2008-4255, 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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