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Vulnerability record · CVE-2009-4049 · published 23 November 2009

CVE-2009-4049: Avast antivirus home memory buffer overflow vulnerability

Avast · Avast Antivirus Home

Heap-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 service (memory corruption) or possibly gain privileges via crafted arguments to IOCTL 0x80002024.

7.2 CVSS 2.0 High EPSS 1.1% · top 35.8% CWE-119 · Memory buffer overflow
7.2CVSS 2.0 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

Heap-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 service (memory corruption) or possibly gain privileges via crafted arguments to IOCTL 0x80002024.

AV:L/AC:L/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/37368 Vendor Advisory
http://www.efblog.net/2009/11/avast-aswrdrsys-kernel-pool-corruption.html
http://www.securityfocus.com/archive/1/507891/100/0/threaded
http://www.securityfocus.com/bid/37031 Exploit
http://www.vupen.com/english/advisories/2009/3266 Vendor Advisory
https://www.evilfingers.com/advisory/Advisory/Avast_aswRdr_sys_Kernel_Pool_Corruption_and_Local_Privilege_Escalation.php
http://secunia.com/advisories/37368 Vendor Advisory
http://www.efblog.net/2009/11/avast-aswrdrsys-kernel-pool-corruption.html
http://www.securityfocus.com/archive/1/507891/100/0/threaded
http://www.securityfocus.com/bid/37031 Exploit
http://www.vupen.com/english/advisories/2009/3266 Vendor Advisory
https://www.evilfingers.com/advisory/Advisory/Avast_aswRdr_sys_Kernel_Pool_Corruption_and_Local_Privilege_Escalation.php

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2009-4049), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.