Local code execution via oversized -p argument
Published Mar 28, 2026 · Updated Mar 28, 2026
Stack-based buffer overflow in YASR 0.6.9-5 allows local users to crash the process or execute arbitrary code through an oversized -p argument. The command-line parser copies the argument into a fixed-size stack buffer without enforcing its capacity, allowing the payload to overwrite the saved return address. Any local user able to launch yasr can trigger the fault; successful shellcode runs with the process's privileges, while an unsuccessful attempt crashes only yasr.
Summary
What happened
Stack-based buffer overflow in YASR 0.6.9-5 allows local users to crash the process or execute arbitrary code through an oversized -p argument. The command-line parser copies the argument into a fixed-size stack buffer without enforcing its capacity, allowing the payload to overwrite the saved return address. Any local user able to launch yasr can trigger the fault; successful shellcode runs with the process's privileges, while an unsuccessful attempt crashes only yasr.
The record
- CVE
- CVE-2016-20041
- Published
- Mar 28, 2026
- Updated
- Mar 28, 2026
- Vendor
- Michael P. Gorse
- Product
- YASR
- Classifications
- CWE-22, T1203
- 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?
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- Affected versionversion=0.6.9-5
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
- ExploitDB-39734proof of concept · unverified
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Technologies
Your stack
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Your stack
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