CVE-2009-4049: n/a vulnerability

CVE-2009-4049: Heap-based buffer overflow in aswRdr.sys (aka the TDI RDR driver) in avast!

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 06:45 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2009-4049 affects an old avast! antivirus kernel driver. A local user could trigger memory corruption, causing a crash or possibly gaining higher privileges. This matters mainly for legacy Windows systems still running avast! Home or Professional 4.8.1356.0. Exposure is likely limited to legacy endpoints running avast! Home or Professional 4.8.1356.0 with the aswRdr.sys driver installed. Modern Avast deployments are not identified as affected in the provided sources. Treat as urgent only if legacy avast! 4.8.1356.0 remains in use. The business risk is local privilege escalation on outdated endpoints, not broad remote compromise. Confirm exposure first, then remove or upgrade affected installations. Mitigation focus: Identify and remove unsupported avast! 4.8.1356.0 installations.; Check Avast vendor guidance for fixed or supported versions.; Upgrade affected systems to a supported antivirus product or version..

Prepared: Jun 28, 2026, 16:10 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 23, 2009, 17:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://www.evilfingers.com/advisory/Advisory/Avast_aswRdr_sys_Kernel_Pool_Corruption_and_Local_Privilege_Escalation.phpCVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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