CVE-2009-0084Directx Code Injection
Use-after-free vulnerability in DirectShow in Microsoft DirectX 8.1 and 9.0 allows remote attackers to execute arbitrary code via an MJPEG file or video stream with a malformed Huffman table, which triggers an exception that frees heap memory that is later accessed, aka "MJPEG…
Published Apr 15, 2009 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2009-0084 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Directx (Microsoft).
- It is exploited in the wild, listed in Industry KEV feed since Oct 18, 2012. No public exploit code is known.
- EPSS estimates a 32% 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)
32%
Higher than 98.3% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
49/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Oct 18, 2012
1282 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
1
Reports of active use
Description
Use-after-free vulnerability in DirectShow in Microsoft DirectX 8.1 and 9.0 allows remote attackers to execute arbitrary code via an MJPEG file or video stream with a malformed Huffman table, which triggers an exception that frees heap memory that is later accessed, aka "MJPEG Decompression Vulnerability."
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Oct 18, 2012 | n/a | Not reported |
Affected Products
5 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| DirectxMicrosoft | 8.1, 9.0, 9.0a, 9.0b, 9.0c | n/a |
Timeline
Publicly disclosed
Apr 15, 2009
Added to Industry KEV feed
Oct 18, 2012
Last updated
Apr 22, 2026
Weakness Type
- CWE-94 Improper Control of Generation of Code ('Code Injection')
References
- exploitVulnCheck exploitation report
- other53632
- otherMS09-011
- other34665
- otheroval:org.mitre.oval:def:5618
FAQ
Common Questions.
Use-after-free vulnerability in DirectShow in Microsoft DirectX 8.1 and 9.0 allows remote attackers to execute arbitrary code via an MJPEG file or video stream with a malformed Huffman table, which triggers an exception that frees heap memory that is later accessed, aka "MJPEG Decompression Vulnerability."
Affected: Directx (Microsoft) versions 8.1, 9.0, 9.0a, 9.0b, 9.0c. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Oct 18, 2012.
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-2009-0084 On Your Attack Surface?
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