CVE-2018-25220 — Bochs 2.6-5 Buffer Overflow Remote Code Execution

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CRITICAL

Bochs 2.6-5 Buffer Overflow Remote Code Execution

Published Mar 28, 2026

9.3

CRITICAL

CVSS 4.0

EPSS 0.64%

Description

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 followed by a return-oriented programming chain to overwrite the instruction pointer and execute shell commands with application privileges.

Affected products

Vendor Bochs Product Bochs Default
n/a
- Version
  2.6-5
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Bochs

n/a

Version	Status	Constraints
2.6-5	affected	-

Remediation

No remediation recorded yet.

Metrics

0.64% 0.00637

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.00637

Score over time

Mar–Oct 2026

EPSS v4
EPSS v5

Percentile over time

EPSS v4
EPSS v5

Table of values (3 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 2, 2026	0.64% (0.00637)	48.68th	v5 (v2026.06.15)
Jun 15, 2026	0.64% (0.00637)	45.55th	v5 (v2026.06.15)
Mar 28, 2026	0.07% (0.00068)	20.87th	v4 (v2025.03.14)

Weaknesses (1)

CWE-787

Out-of-bounds Write

References (3)

http://bochs.sourceforge.net/
product
https://www.exploit-db.com/exploits/43979
exploitVDB Entry
https://www.vulncheck.com/advisories/bochs-5-buffer-overflow-remote-code-execution
third-party-advisoryThird Party Advisory

Link	Providers	Tags
http://bochs.sourceforge.net/		product
https://www.exploit-db.com/exploits/43979		exploitVDB Entry
https://www.vulncheck.com/advisories/bochs-5-buffer-overflow-remote-code-execution		third-party-advisoryThird Party Advisory