Unauthenticated code execution via CGI POST integer overflow
Published Feb 27, 2025 · Updated Jul 5, 2026
Integer overflow in the CGI parser of DrayTek Vigor router firmware allows remote attackers to execute arbitrary code via HTTP POST requests. The parser uses the Content-Length header to size a request-data allocation without preventing integer wraparound, allowing the request body to overflow heap memory. No authentication or user interaction is required; successful exploitation executes code on the router and permits complete device compromise.
Summary
What happened
Integer overflow in the CGI parser of DrayTek Vigor router firmware allows remote attackers to execute arbitrary code via HTTP POST requests. The parser uses the Content-Length header to size a request-data allocation without preventing integer wraparound, allowing the request body to overflow heap memory. No authentication or user interaction is required; successful exploitation executes code on the router and permits complete device compromise.
The record
- CVE
- CVE-2024-51139
- Published
- Feb 27, 2025
- Updated
- Jul 5, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 27, 2025CVE publishedPublication date reported by the CVE source.
- Jul 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
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