Local Buffer Overflow Vulnerability in Prime95 by Mersenne
CVE-2018-25299

8.6HIGH

Key Information:

Vendor

Mersenne

Status
Prime95
Vendor
CVE Published:
29 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2018-25299?

The Prime95 29.4b8 version is susceptible to a local buffer overflow vulnerability due to flawed handling of structured exception handling (SEH). This flaw enables attackers to execute arbitrary code by injecting malicious payloads through the optional proxy hostname field in the PrimeNet settings. If successfully exploited, this vulnerability could allow an intruder to run arbitrary system commands, posing a significant security risk to affected installations.

Affected Version(s)

Prime95 29.4b8

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2018-25299 - Proof of Concept

References

https://www.exploit-db.com/exploits/44649
exploit
https://www.mersenne.org/
product
https://www.mersenne.org/download/#download
product

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

crash_manucoot
.