RCE in Zen Load Balancer
CVE-2012-10039
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
EPSS exploit prediction
EPSS: 0.024 (83.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000
Affected products
- Zen Load Balancer — versions 3.0-rc1, 2.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- web.archive.org/web/20221203195056/https://itsecuritysolutions.org/2012-09-21-Z… (technical-description, exploit)
- web.archive.org/web/20111015031540/http://www.zenloadbalancer.com/ (product)
- raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/l… (exploit)
- www.exploit-db.com/exploits/21849 (exploit)
- www.fortiguard.com/encyclopedia/ips/33335/zen-load-balancer-filelog-command-exe… (third-party-advisory)
Frequently asked questions
- What is CVE-2012-10039?
- CVE-2012-10039 is a vulnerability in Zen Load Balancer, classified under OS Command Injection. Published 2025-08-11.
- Is CVE-2012-10039 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.