7.8

CVE-2009-1123: Microsoft Windows Improper Input Validation Vulnerability

CVSS: 7.8v3.1HighKEVAnalyzed
Published 10-06-2009Last modified 22-10-2025
Open JSON

Vulnerability summary

CVE-2009-1123 is a high (CVSS 7.8) vulnerability in Microsoft Windows. It is known to be exploited: CISA lists it, first on 03-03-2022. EPSS estimates a 4.88% chance of exploitation in the next 30 days, higher than 91.9% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
4.88%
0%100%
Low · 0.00 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-06-2009
    PublishedVulnerability first disclosed.
  2. 03-03-2022
    Added to CISA KEVMicrosoft Windows Improper Input Validation Vulnerability
  3. 24-03-2022
    CISA remediation dueApply updates per vendor instructions.
  4. 22-10-2025
    Last modifiedVulnerability information updated.

Description

The kernel in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 SP2 does not properly validate changes to unspecified kernel objects, which allows local users to gain privileges via a crafted application, aka "Windows Kernel Desktop Vulnerability."

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

4.88%

Chance of exploitation in the next 30 days

Percentile

92%

Versus all other CVEs

30-day change

0.00 pp

From 4.88% on 20-09-2026

20-09-202620-10-2026
EPSS score
4.88%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
03-03-2022
Federal due date
24-03-2022

CISA required action

Apply updates per vendor instructions. nvd.nist.gov/vuln/detail/CVE-2009-1123

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Microsoft5 products

1 vendor · 5 products

References

8 links