# 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.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **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 available:** No
- **Published:** 8 Aug 2025
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-hjc5-mwx5-gc6h

## 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 (Stack-based Buffer Overflow)

## 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.

## 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:

- ActiveFax (ActFax) 4.3 Client Importer Buffer Overflow (metasploit)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2012-10043 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2012-10043 exists.

Affected product: ActFax Server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2012-10043/ (Markdown: https://insights.sbomify.com/CVE-2012-10043/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2012-10043
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2012-10043
- OSV: https://osv.dev/vulnerability/CVE-2012-10043

---
From sbomify Insights: https://insights.sbomify.com/CVE-2012-10043/
Summaries are generated and may contain mistakes; the official description above is the record.