Local code execution via proxy hostname overflow
Published Apr 29, 2026 · Updated Apr 29, 2026
Stack buffer overflow in Prime95 29.4b8 allows local users to execute arbitrary code through a crafted PrimeNet proxy hostname. The PrimeNet connection settings handler accepts an overlong optional proxy hostname and overwrites the SEH record on the stack. The attacker must place the payload in the local configuration field; successful SEH control runs commands in the Prime95 process context.
Summary
What happened
Stack buffer overflow in Prime95 29.4b8 allows local users to execute arbitrary code through a crafted PrimeNet proxy hostname. The PrimeNet connection settings handler accepts an overlong optional proxy hostname and overwrites the SEH record on the stack. The attacker must place the payload in the local configuration field; successful SEH control runs commands in the Prime95 process context.
The record
- CVE
- CVE-2018-25299
- Published
- Apr 29, 2026
- Updated
- Apr 29, 2026
- Vendor
- Mersenne Research, Inc.
- Product
- Prime95
- Classifications
- CWE-120, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 29, 2026CVE publishedPublication date reported by the CVE source.
- Apr 29, 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=29.4b8
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
- Prime95 29.4b8 Stack Buffer Overflow SEH exploitfunctional · demonstrated
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Technologies
Your stack
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Your stack
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