What is CVE-2018-25293?

CVE-2018-25293 is a medium-severity vulnerability in Mersenne Prime95, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.2/10. Published 2026-04-26.

How severe is CVE-2018-25293?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Buffer overflow in Mersenne Prime95

CVE-2018-25293

Prime95 29.4b7 contains a buffer overflow vulnerability in the PrimeNet connection dialog that allows local attackers to crash the application by supplying an excessively long string in the optional proxy password field. Attackers can trig…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (4.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Mersenne Prime95 — versions 29.4b7

Weakness classification (CWE)

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

References

ExploitDB-45226 (exploit)
Official Product Homepage (product)
Product Reference (product)
VulnCheck Advisory: Prime95 29.4b7 Denial of Service via Proxy Password Field (third-party-advisory)

Frequently asked questions

What is CVE-2018-25293?: CVE-2018-25293 is a medium-severity vulnerability in Mersenne Prime95, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.2/10. Published 2026-04-26.
How severe is CVE-2018-25293?: Medium severity. CVSS v3 base score is 6.2 out of 10.