CVE-2009-3523

NONECVSS 0.0Weaponized
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 1%CVSS: —Exploit: NoneExposed: 0

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

aavmKer4.sys in avast! Home and Professional for Windows before 4.8.1356 does not properly validate input to IOCTLs (1) 0xb2d6000c and (2) 0xb2d60034, which allows local users to gain privileges via IOCTL requests using crafted kernel addresses that trigger memory corruption, a different vulnerability than CVE-2008-1625.

CVSS v3
—
EG Score
0.0(none)
EPSS
51.5%
KEV
Not listed

Published

October 1, 2009

Last Modified

April 23, 2026

References (8)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 42× 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. 2026-07-06 16:23 UTCEPSS rescore
  2. 2026-07-06 02:19 UTCEPSS rescore
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  1. 2026-06-19 19:22 UTCEPSS rescore
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  25. 2026-06-05 06:07 UTCEPSS rescore
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  30. 2026-06-01 13:49 UTCEPSS rescore
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  32. 2026-05-31 22:28 UTCEPSS rescore
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  34. 2026-05-31 00:13 UTCEPSS rescore
  35. 2026-05-31 00:13 UTCEPSS rescore
  36. 2026-05-30 15:01 UTCEG score recompute
  37. 2026-05-30 15:01 UTCGHSA enrichment
  38. 2026-05-29 13:40 UTCEPSS rescore
  39. 2026-05-28 13:42 UTCEPSS rescore
  40. 2026-05-28 13:42 UTCEPSS rescore
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  42. 2026-05-27 13:38 UTCEPSS rescore
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  44. 2026-05-26 13:41 UTCEPSS rescore
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  46. 2026-05-26 07:16 UTCEPSS rescore
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  48. 2026-05-24 16:43 UTCEPSS rescore
  49. 2026-05-22 21:15 UTCEPSS rescore
  50. 2026-05-22 21:15 UTCEPSS rescore
  51. 2026-05-20 22:37 UTCEPSS rescore
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  53. 2026-05-20 11:21 UTCEPSS rescore
  54. 2026-05-20 11:20 UTCEPSS rescore
  55. 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-12406✓ verified
    First seen Apr 27, 2010

    Avast! 4.7 - 'aavmker4.sys' Local Privilege Escalation

    Open source ↗

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2009-3523?
CVE-2009-3523 is a none vulnerability published on October 1, 2009. aavmKer4.sys in avast! Home and Professional for Windows before 4.8.1356 does not properly validate input to IOCTLs (1) 0xb2d6000c and (2) 0xb2d60034, which allows local users to gain privileges via IOCTL requests using crafted kernel addresses that trigger memory corruption, a different…
When was CVE-2009-3523 disclosed?
CVE-2009-3523 was first published in the National Vulnerability Database on October 1, 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-2009-3523 actively exploited?
CVE-2009-3523 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 51.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-3523?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-3523, 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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