What is CVE-2018-25299?

CVE-2018-25299 is a high-severity vulnerability in Mersenne Prime95, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.4/10. Published 2026-04-29.

How severe is CVE-2018-25299?

High severity. CVSS v3 base score is 8.4 out of 10.

Buffer overflow in Mersenne Prime95

CVE-2018-25299

Prime95 29.4b8 contains a local buffer overflow vulnerability that allows attackers to execute arbitrary code by exploiting structured exception handling (SEH) mechanisms. Attackers can inject malicious payload through the optional proxy h…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (5.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mersenne Prime95 — versions 29.4b8

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

ExploitDB-44649 (exploit)
Official Product Homepage (product)
Product Reference (product)
VulnCheck Advisory: Prime95 29.4b8 Local Buffer Overflow via SEH (third-party-advisory)

Frequently asked questions

What is CVE-2018-25299?: CVE-2018-25299 is a high-severity vulnerability in Mersenne Prime95, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.4/10. Published 2026-04-29.
How severe is CVE-2018-25299?: High severity. CVSS v3 base score is 8.4 out of 10.