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 with 238 bytes of data to trigger a buffer overflow condition that causes the application to crash.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (41.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Winmtr — versions 0.91
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/45769 (Exploit, VDB Entry, Third Party Advisory, exploit)
- winmtr.net (Product, product)
- winmtr.net/winmtr_download/ (Exploit, product)
- www.vulncheck.com/advisories/winmtr-denial-of-service-via-buffer-overflow (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.