CVE-2009-3674Internet Explorer Vulnerability
Microsoft Internet Explorer 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, leading to memory corruption, aka "Uninitialized Memory Corruption…
Published Dec 9, 2009 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2009-3674 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Internet Explorer (Microsoft), Windows 2000 (Microsoft), Windows 7 (Microsoft) and 4 more products.
- It is exploited in the wild, listed in Industry KEV feed since Sep 29, 2016. No public exploit code is known.
- EPSS estimates a 26% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v2
9.3
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
26%
Higher than 98.0% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
48/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Sep 29, 2016
2486 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
2
Reports of active use
Description
Microsoft Internet Explorer 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, leading to memory corruption, aka "Uninitialized Memory Corruption Vulnerability," a different vulnerability than CVE-2009-3671.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Sep 29, 2016 | n/a | Not reported |
Affected Products
23 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Internet ExplorerMicrosoft | 5.0.1-sp4, 6, 6-sp1, 7, 8 | n/a |
| Windows 2000Microsoft | See advisory | n/a |
| Windows 7Microsoft | See advisory | n/a |
| Windows Server 2003Microsoft | See advisory | n/a |
| Windows Server 2008Microsoft | See advisory | n/a |
Timeline
Publicly disclosed
Dec 9, 2009
Added to Industry KEV feed
Sep 29, 2016
Last updated
Apr 22, 2026
Weakness Type
- CWE-399
References
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- otherMS09-072
- otheroval:org.mitre.oval:def:6570
- other1023293
FAQ
Common Questions.
Microsoft Internet Explorer 8 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, leading to memory corruption, aka "Uninitialized Memory Corruption Vulnerability," a different vulnerability…
Affected: Internet Explorer (Microsoft) versions 5.0.1-sp4, 6, 6-sp1, 7, 8; Windows 2000 (Microsoft); Windows 7 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Sep 29, 2016.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2009-3674 On Your Attack Surface?
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