Vulnerability Report

CVE-2009-3523

Title: Avast Avast Antivirus Home Auth Bypass

Auth Bypass

Proof Of Concept

PoC Available for CVE-2009-3523

CWE Category CWE-20

Published Date Oct 01, 2009

Modified Date Jun 16, 2026

Exploit Status Available

Score 6.9 CVSS v2.0

Exploit Probability (EPSS)

0.78%

Vulnerability Summary

CVE-2009-3523: 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.

Impacted Vendors

avast 2

Reference Links

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

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

6.9

Access Vector

N/A

Authentication

N/A

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2009-3523 Exploits & PoCs (Proof Of Concept)

Exploit-DB https://www.exploit-db.com/exploits/12406

View Code

June 16, 2026 MODIFIED

Vulnerability data updated via NVD.

April 09, 2025 MODIFIED

Vulnerability data or affected products updated.

October 01, 2009 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector N/A

Complexity N/A

Privileges N/A

Interaction NONE

CVSS Vector String


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

Affected Stack

No specific products linked.