CVE-2025-34124 Heroes of Might and Magic III .h3m Map File Buffer Overflow
Attackers can execute arbitrary code by tricking users into opening malicious .h3m map files in Heroes of Might and Magic III.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-34124?
CVE-2025-34124 is a high-severity memory corruption vulnerability in The 3DO Company Heroes of Might and Magic III, published on 16 Jul 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2025-34124?
How do I fix CVE-2025-34124?
No fix has been published for CVE-2025-34124 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-34124 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34124 exists.
Public exploit code: 1 Metasploit module.
Sources
Also known as GHSA-72f4-q73h-wfwq.