6.9

CVE-2009-3523: avast avast_antivirus_home Improper Input Validation

CVSS: 6.9v2.0MediumModified
Published 01-10-2009Last modified 07-08-2024
Open JSON

Vulnerability summary

CVE-2009-3523 is a medium (CVSS 6.9) Improper Input Validation vulnerability in avast avast_antivirus_home. EPSS estimates a 0.78% chance of exploitation in the next 30 days, higher than 55.4% of scored vulnerabilities. 2 public exploits are recorded.

Overall risk
38/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.9/10
010
Medium · v2.0 (NVD)
EPSS score
0.78%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits2reference, exploit-database

Timeline

  1. 01-10-2009
    PublishedVulnerability first disclosed.
  2. 07-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

0.78%

Chance of exploitation in the next 30 days

Percentile

55%

Versus all other CVEs

30-day change

0.00 pp

From 0.78% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.78%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

2 found
  • referenceUnverified

    Exploit Reference (ntinternals.org)

    Maturity: unknown

  • exploit-databaselocalwindowsVerified

    Avast! 4.7 - 'aavmker4.sys' Local Privilege Escalation

    Maturity: weaponized

Weaknesses

CWE · root cause

Affected systems

Avast2 products
  • avast_antivirus_home≤ 4.8.1351 | 4.7.827 | 4.7.844 | 4.7.869 | 4.7.1043 | 4.7.1098 | 4.8.1169 | 4.8.1195 | 4.8.1201 | 4.8.1227 | 4.8.1229 | 4.8.1282 | 4.8.1290 | 4.8.1296 | 4.8.1335
  • avast_antivirus_professional≤ 4.8.1351 | 4.7.827 | 4.7.844 | 4.7.1043 | 4.7.1098 | 4.8.1169 | 4.8.1195 | 4.8.1201 | 4.8.1227 | 4.8.1229 | 4.8.1282 | 4.8.1290 | 4.8.1296 | 4.8.1335

1 vendor · 2 products

References

4 links