CVE-2009-4049

Heap-based buffer overflow in aswRdr.sys (aka the TDI RDR driver) in avast! Home and Professional...

7.2 HighPublic exploit

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.

Exploit likelihood

1.10%Down 0.8 points since Feb 4, 2022

What each source reports

NVD Score used 7.2

Record: CVE-2009-4049
CVSS 2.0: 7.2 HighAV:L/AC:L/Au:N/C:C/I:C/A:C
Weakness: CWE-119
Updated: 2026-11-02

CVE List No score

Record: CVE-2009-4049
Updated: 2026-11-02

EUVDEUVD-2009-4020 No score

Record: EUVD-2009-4020
Updated: 2026-11-03

GitHub AdvisoriesGHSA-842f-8x99-f2w9 No score

Heap-based buffer overflow in aswRdr.sys (aka the TDI RDR driver) in avast! Home and Professional...

Record: GHSA-842f-8x99-f2w9
Weakness: CWE-119
Updated: 2026-11-02

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Exploit-DB	Avast! AntiVirus 4.8.1356 - 'aswRdr.sys' Driver Privilege Escalation	2009-11-16
PoC in GitHub	fengjixuchui/CVE-2009-4049	2022-07-10

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, Exploit-DB, GitHub Advisories, NVD, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2009-4049 is a high vulnerability (CVSS 7.2) in Avast Antivirus Home, published November 23, 2009. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.10%, the 65th percentile. No source names a fixed version.