HOMEVULNERABILITIESCVE-2009-3523
MEDIUMPOC

CVE-2009-3523

CWE-20Published: October 1, 2009· Updated: Jun 16, 2026

6.9
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2009-3523 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2009-3523. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityM
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityC
IntegrityC
AvailabilityC
AV:L/AC:M/Au:N/C:C/I:C/A:C

Affected Vendors & Products

avast2 product(s)
avast antivirus homeavast antivirus professional
Source: NVD CPE · 29 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://secunia.com/advisories/36858
ADVISORYhttp://secunia.com/advisories/36858

All References (8)

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

Quick Facts

CVE IDCVE-2009-3523
CVSS Score6.9 / 10
SeverityMEDIUM
WeaknessCWE-20
CISA KEVNo
ExploitPOC
Affected1 vendor(s)
PublishedOct 1, 2009

Related CVEs (CWE-20)

CVE-2002-1874
10.0
CVE-2002-1360
10.0
CVE-2002-1358
10.0
CVE-2021-26622
10.0
CVE-2025-34105
10.0
CVE-2002-2236
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2009-3523 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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