What is CVE-2018-25220?

CVE-2018-25220 is a critical-severity vulnerability in Bochs, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-03-28.

How severe is CVE-2018-25220?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Bochs

CVE-2018-25220

Bochs 2.6-5 contains a stack-based buffer overflow vulnerability that allows attackers to execute arbitrary code by supplying an oversized input string to the application. Attackers can craft a malicious payload with 1200 bytes of padding…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (29.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Bochs — versions 2.6-5

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

ExploitDB-43979 (exploit)
Official Product Homepage (product)
VulnCheck Advisory: Bochs 2.6-5 Buffer Overflow Remote Code Execution (third-party-advisory)

Frequently asked questions

What is CVE-2018-25220?: CVE-2018-25220 is a critical-severity vulnerability in Bochs, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-03-28.
How severe is CVE-2018-25220?: Critical severity. CVSS v3 base score is 9.8 out of 10.