CVE-2012-10043 ActFax 4.32 Client Importer Buffer Overflow
A stack-based buffer overflow in ActFax Server allows arbitrary code execution via a malicious .exp file import.
- 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-2012-10043?
CVE-2012-10043 is a critical memory corruption vulnerability in ActFax Server, published on 8 Aug 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 stack-based buffer overflow vulnerability exists in ActFax Server version 4.32, specifically in the "Import Users from File" functionality of the client interface. The application fails to properly validate the length of tab-delimited fields in .exp files, leading to unsafe usage of strcpy() during CSV parsing. An attacker can exploit this vulnerability by crafting a malicious .exp file and importing it using the default character set "ECMA-94 / Latin 1 (ISO 8859)". Successful exploitation may result in arbitrary code execution, leading to full system compromise. User interaction is required to trigger the vulnerability.
Weakness: CWE-121
Which versions are affected by CVE-2012-10043?
How do I fix CVE-2012-10043?
No fix has been published for CVE-2012-10043 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-2012-10043 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2012-10043 exists.
Public exploit code: 1 Metasploit module.
Sources
Also known as GHSA-hjc5-mwx5-gc6h.