How severe is CVE-2009-4049?

CVE-2009-4049 has a CVSS 2.0 base score of 7.2, rated high severity.

Is CVE-2009-4049 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4049?

CVE-2009-4049 primarily affects Avast Avast Antivirus Home. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4049?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2009-4049 published?

CVE-2009-4049 was published on 2009-11-23 and last updated on 2026-06-16.

CVE-2009-4049

CVE-2009-4049 is a high-severity vulnerability in Avast Avast Antivirus Home with a CVSS 2.0 base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 2.0 base score 7.2)
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Avast Avast Antivirus Home
Published: 2009-11-23
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2009-4049?: 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.
How severe is CVE-2009-4049?: CVE-2009-4049 has a CVSS 2.0 base score of 7.2, rated high severity.
Is CVE-2009-4049 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4049?: CVE-2009-4049 primarily affects Avast Avast Antivirus Home. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4049?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2009-4049 published?: CVE-2009-4049 was published on 2009-11-23 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:avast:avast_antivirus_home:4.8.1356.0:*:*:*:*:*:*:*
cpe:2.3:a:avast:avast_antivirus_professional:4.8.1356.0:*:*:*:*:*:*:*

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