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Vulnerability record · CVE-2009-3523 · published 1 October 2009

CVE-2009-3523: Avast antivirus home improper input validation vulnerability

Avast · Avast Antivirus Home

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.

6.9 CVSS 2.0 Medium EPSS 0.78% · top 45.8% CWE-20 · Improper input validation
6.9CVSS 2.0 base score
0.78%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

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.

AV:L/AC:M/Au:N/C:C/I:C/A:C

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://secunia.com/advisories/36858 Vendor Advisory
http://www.avast.com/eng/avast-4-home_pro-revision-history.html
http://www.ntinternals.org/ntiadv0904/ntiadv0904.html Exploit
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6024
http://secunia.com/advisories/36858 Vendor Advisory
http://www.avast.com/eng/avast-4-home_pro-revision-history.html
http://www.ntinternals.org/ntiadv0904/ntiadv0904.html Exploit
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6024

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2007-1673Amavis vulnerabilityunzoo.c, as used in multiple products including AMaViS 2.4.1 and earlier, allows remote attackers to cause a denial of service (infinite loop) via a …EPSS 3.2%7.2CVE-2010-0705Avast antivirus home improper input validation vulnerabilityAavmker4.sys in avast! 4.8 through 4.8.1368.0 and 5.0 before 5.0.418.0 running on Windows 2000 and XP does not properly validate input to IOCTL 0xb2d…EPSS 0.93%7.2CVE-2009-4049Avast antivirus home memory buffer overflow vulnerabilityHeap-based buffer overflow in aswRdr.sys (aka the TDI RDR driver) in avast! Home and Professional 4.8.1356.0 allows local users to cause a denial of …EPSS 1.1%7.2CVE-2009-3522Avast antivirus home memory buffer overflow vulnerabilityStack-based buffer overflow in aswMon2.sys in avast! Home and Professional for Windows 4.8.1351, and possibly other versions before 4.8.1356, allows …EPSS 0.95%7.2CVE-2009-3524Avast antivirus home vulnerabilityUnspecified vulnerability in ashWsFtr.dll in avast! Home and Professional for Windows before 4.8.1356 has unknown impact and local attack vectors.EPSS 0.38%6.8CVE-2008-1625Avast antivirus home permissions and access controls vulnerabilityaavmker4.sys in avast! Home and Professional 4.7 for Windows does not properly validate input to IOCTL 0xb2d60030, which allows local users to gain p…EPSS 0.71%6.8CVE-2007-6265Avast antivirus home memory buffer overflow vulnerabilityUnspecified vulnerability in avast! 4 Home and Professional Editions before 4.7.1098 allows remote attackers to have an unknown impact via a crafted …EPSS 1.3%9.5CVE-2026-88771Citrix netscaler application delivery controller improper input validation vulnerabilityImproper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-…KEV

Source: NIST National Vulnerability Database (record CVE-2009-3523), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.