Local vpncmd crash via unchecked numeric input
Published Mar 12, 2025 · Updated Jul 19, 2025
Stack buffer overflow in SoftEther VPN 5.02.5187 allows local users to crash vpncmd by entering an oversized numeric field. UniToInt passes a 128-byte stack buffer to UniToStrForSingleChars, which ignores its dst_size argument and copies every input character into that buffer. The supplier states that only an administrator deliberately entering a long value in the local vpncmd UI can trigger the crash, and it disputes any security impact beyond that user's own process.
Summary
What happened
Stack buffer overflow in SoftEther VPN 5.02.5187 allows local users to crash vpncmd by entering an oversized numeric field. UniToInt passes a 128-byte stack buffer to UniToStrForSingleChars, which ignores its dst_size argument and copies every input character into that buffer. The supplier states that only an administrator deliberately entering a long value in the local vpncmd UI can trigger the crash, and it disputes any security impact beyond that user's own process.
The record
- CVE
- CVE-2025-25567
- Published
- Mar 12, 2025
- Updated
- Jul 19, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Mar 12, 2025CVE publishedPublication date reported by the CVE source.
- Jul 19, 2025Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
- vpncmd oversized-input reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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