CVE-2009-0555Windows Media Format Runtime Code Injection
Microsoft Windows Media Runtime, as used in DirectShow WMA Voice Codec, Windows Media Audio Voice Decoder, and Audio Compression Manager (ACM), does not properly process Advanced Systems Format (ASF) files, which allows remote attackers to execute arbitrary code via a crafted…
Published Oct 14, 2009 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2009-0555 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Windows Media Format Runtime (Microsoft), Windows Media Player (Microsoft), Windows 2000 (Microsoft) and 4 more products.
- It is exploited in the wild, listed in Industry KEV feed since Nov 10, 2009. No public exploit code is known.
- EPSS estimates a 27% 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)
27%
Higher than 98.0% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
52/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Nov 10, 2009
27 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
Advisories And Exploit References
- advisoryoval:org.mitre.oval:def:6407
- advisoryTA09-286A
- patchMS09-051
Description
Microsoft Windows Media Runtime, as used in DirectShow WMA Voice Codec, Windows Media Audio Voice Decoder, and Audio Compression Manager (ACM), does not properly process Advanced Systems Format (ASF) files, which allows remote attackers to execute arbitrary code via a crafted audio file that uses the Windows Media Speech codec, aka "Windows Media Runtime Voice Sample Rate Vulnerability."
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Nov 10, 2009 | n/a | Not reported |
Affected Products
20 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows Media Format RuntimeMicrosoft | 11, 9.0, 9.5 | n/a |
| Windows Media PlayerMicrosoft | 9 | n/a |
| Windows 2000Microsoft | See advisory | n/a |
| Windows Server 2003Microsoft | See advisory | n/a |
| Windows Server 2008Microsoft | See advisory | n/a |
Timeline
Publicly disclosed
Oct 14, 2009
Added to Industry KEV feed
Nov 10, 2009
Last updated
Apr 22, 2026
Weakness Type
- CWE-94 Improper Control of Generation of Code ('Code Injection')
References
- advisoryoval:org.mitre.oval:def:6407
- advisoryTA09-286A
- patchMS09-051
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Microsoft Windows Media Runtime, as used in DirectShow WMA Voice Codec, Windows Media Audio Voice Decoder, and Audio Compression Manager (ACM), does not properly process Advanced Systems Format (ASF) files, which allows remote attackers to execute arbitrary code via a crafted audio file that uses the Windows Media Spe…
Affected: Windows Media Format Runtime (Microsoft) versions 11, 9.0, 9.5; Windows Media Player (Microsoft) versions 9; Windows 2000 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Nov 10, 2009.
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-2009-0555 On Your Attack Surface?
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