CVE-2009-1831Winamp Vulnerability
The Nullsoft Modern Skins Support module (gen_ff.dll) in Nullsoft Winamp before 5.552 allows remote attackers to execute arbitrary code via a crafted MAKI file, which triggers an incorrect sign extension, an integer overflow, and a stack-based buffer overflow.
Published May 29, 2009 · Updated Apr 22, 2026
Key Facts
Patch immediately- CVE-2009-1831 is a critical-severity vulnerability (CVSS 9.3 v2) affecting Winamp (Nullsoft).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 36% probability of exploitation in the next 30 days.
- Fixed versions are available, including Winamp 5.55.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v2
9.3
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS (30-day exploit likelihood)
36%
Higher than 98.4% of all scored CVEs
Exploit maturity
Weaponized
ATLAS score
54/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Weaponized
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Description
The Nullsoft Modern Skins Support module (gen_ff.dll) in Nullsoft Winamp before 5.552 allows remote attackers to execute arbitrary code via a crafted MAKI file, which triggers an incorrect sign extension, an integer overflow, and a stack-based buffer overflow.
Affected Products
84 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| WinampNullsoft | 2.0, 2.10, 2.24, 2.4, 2.50, 2.5e, 2.60, 2.61 | 5.55 |
Patched Releases
Winamp
5.55
Timeline
Publicly disclosed
May 29, 2009
Last updated
Apr 22, 2026
Weakness Type
- CWE-189
References
- exploitMSF winamp_maki_bof.rb
- exploitExploitDB-21256
- exploit35052
- otherwinamp-maki-overflow(50664)
- otheroval:org.mitre.oval:def:15683
FAQ
Common Questions.
The Nullsoft Modern Skins Support module (gen_ff.dll) in Nullsoft Winamp before 5.552 allows remote attackers to execute arbitrary code via a crafted MAKI file, which triggers an incorrect sign extension, an integer overflow, and a stack-based buffer overflow.
Affected: Winamp (Nullsoft) versions 2.0, 2.10, 2.24, 2.4, 2.50, 2.5e, 2.60, 2.61. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Winamp 5.55.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2009-1831 On Your Attack Surface?
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