What is CVE-2018-25426?

CVE-2018-25426 is a high-severity vulnerability in Winmtr, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-05-30.

How severe is CVE-2018-25426?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Winmtr

CVE-2018-25426

WinMTR 0.91 contains a denial of service vulnerability that allows attackers to crash the application by sending a malformed payload file containing a large buffer of repeated characters. Attackers can create a specially crafted input file…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (24.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Winmtr — versions 0.91

Weakness classification (CWE)

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

References

disclosure@vulncheck.com (Exploit, VDB Entry, Third Party Advisory, exploit)
disclosure@vulncheck.com (Product, product)
disclosure@vulncheck.com (Exploit, product)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2018-25426?: CVE-2018-25426 is a high-severity vulnerability in Winmtr, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-05-30.
How severe is CVE-2018-25426?: High severity. CVSS v3 base score is 7.5 out of 10.