Local code execution via oversized mapfile argument
Published Mar 28, 2026 · Updated Mar 28, 2026
Stack-based buffer overflow in kbd project mapscrn 2.0.3 allows local users to execute code through an oversized mapfile argument. The utility passes the attacker-controlled argument to strcpy without enforcing its length, overwriting stack control data including the saved return address. Local command execution is required; successful exploitation runs code with mapscrn's privileges, while failed attempts terminate the process with SIGSEGV.
Summary
What happened
Stack-based buffer overflow in kbd project mapscrn 2.0.3 allows local users to execute code through an oversized mapfile argument. The utility passes the attacker-controlled argument to strcpy without enforcing its length, overwriting stack control data including the saved return address. Local command execution is required; successful exploitation runs code with mapscrn's privileges, while failed attempts terminate the process with SIGSEGV.
The record
- CVE
- CVE-2017-20226
- Published
- Mar 28, 2026
- Updated
- Mar 28, 2026
- Vendor
- kbd project
- Product
- mapscrn
- Classifications
- CWE-787
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 28, 2026CVE publishedPublication date reported by the CVE source.
- Mar 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.03
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Mapscrn 2.03 Local Buffer Overflow PoCproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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