# CVE-2012-10039: ZEN Load Balancer Filelog Command Execution

> Authenticated attackers can execute arbitrary shell commands as root via the filelog parameter in ZEN Load Balancer.

- **Severity:** Critical 9.4 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Aug 2025
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-v54w-jgw5-2q48

## What is CVE-2012-10039?

CVE-2012-10039 is a critical command injection vulnerability in ZEN Load Balancer, published on 11 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

ZEN Load Balancer versions 2.0 and 3.0-rc1 contain a command injection vulnerability in content2-2.cgi. The filelog parameter is passed directly into a backtick-delimited exec() call without sanitation. An authenticated attacker can inject arbitrary shell commands, resulting in remote code execution as the root user. ZEN Load Balancer is the predecessor of ZEVENET and SKUDONET. The affected versions (2.0 and 3.0-rc1) are no longer supported. SKUDONET CE is the current community-maintained successor.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2012-10039?


## How do I fix CVE-2012-10039?

No fix has been published for CVE-2012-10039 yet. Limit exposure of the affected software until one is available.

## Is CVE-2012-10039 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2012-10039 exists.

Public exploit code:

- ZEN Load Balancer Filelog Command Execution (metasploit)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2012-10039 and fix it if it is affected.

What it is: CVE-2012-10039 is a critical command injection vulnerability in ZEN Load Balancer, published on 11 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2012-10039 exists.

Affected product: ZEN Load Balancer. 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-2012-10039/ (Markdown: https://insights.sbomify.com/CVE-2012-10039/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2012-10039
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2012-10039
- OSV: https://osv.dev/vulnerability/CVE-2012-10039

---
From sbomify Insights: https://insights.sbomify.com/CVE-2012-10039/
Summaries are generated and may contain mistakes; the official description above is the record.