CVE-2025-34124

Heroes of Might and Magic III .h3m Map File Buffer Overflow

Published Jul 16, 2025 CVSS 4.0 · 8.4 High EPSS < 1% KEV · Not listed

Description

A buffer overflow vulnerability exists in Heroes of Might and Magic III Complete 4.0.0.0, HD Mod 3.808 build 9, and Demo 1.0.0.0 via malicious .h3m map files that exploit object sprite name parsing logic. The vulnerability occurs during in-game map loading when a crafted object name causes a buffer overflow, potentially allowing arbitrary code execution. Exploitation requires the victim to open a malicious map file within the game.

Affected Products

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

Vendor Product Default status Versions

The 3DO Company

Heroes of Might and Magic III

unaffected

Version	Status	Constraints
`Complete 4.0.0.0`	affected	—
`HD Mod 3.808 build 9`	affected	—
`Demo 1.0.0.0`	affected	—

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2025-21747	A buffer overflow vulnerability exists in Heroes of Might and Magic III Complete 4.0.0.0, HD Mod 3.808 build 9, and Demo 1.0.0.0 via malicious .h3m map files that exploit object sprite name parsing logic. The vulnerability occurs during in-game map loading when a crafted object name causes a buffer overflow, potentially allowing arbitrary code execution. Exploitation requires the victim to open a malicious map file within the game.

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Active

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.522% probability within 30 days)

Exploitation poc

Automatable no

Technical Impact total

References

Link	Providers
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/fileformat/homm3_h3m.rb
https://www.exploit-db.com/exploits/37716
https://www.vulncheck.com/advisories/heroes-of-might-and-magic-iii-map-file-buffer-overflow

History

Jul 17, 2025 8:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Jul 16, 2025 9:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A buffer overflow vulnerability exists in Heroes of Might and Magic III Complete 4.0.0.0, HD Mod 3.808 build 9, and Demo 1.0.0.0 via malicious .h3m map files that exploit object sprite name parsing logic. The vulnerability occurs during in-game map loading when a crafted object name causes a buffer overflow, potentially allowing arbitrary code execution. Exploitation requires the victim to open a malicious map file within the game.
Title		Heroes of Might and Magic III .h3m Map File Buffer Overflow
Weaknesses		CWE-121 CWE-20 CWE-94
References		https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/fileformat/homm3_h3m.rb https://www.exploit-db.com/exploits/37716 https://www.vulncheck.com/advisories/heroes-of-might-and-magic-iii-map-file-buffer-overflow
Metrics		cvssV4_0 `{'score': 8.4, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}`