CVE-2012-10039
CVE-2012-10039 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.
Key facts
- Severity: Critical (CVSS 4.0 base score 9.4)
- EPSS exploit prediction: 2% (82nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2012-6599
- Weakness: CWE-78
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2012-10039?
- CVE-2012-10039 has a CVSS 4.0 base score of 9.4, rated critical severity.
- Is CVE-2012-10039 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2012-10039?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- Does CVE-2012-10039 have an EU (EUVD) identifier?
- Yes. CVE-2012-10039 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2012-6599.
- When was CVE-2012-10039 published?
- CVE-2012-10039 was published on 2025-08-11 and last updated on 2026-06-16.
References
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/http/zen_load_balancer_exec.rb
- https://web.archive.org/web/20111015031540/http://www.zenloadbalancer.com/
- https://web.archive.org/web/20221203195056/https://itsecuritysolutions.org/2012-09-21-ZEN-Load-Balancer-v2.0-and-v3.0-rc1-multiple-vulnerabilities/
- https://www.exploit-db.com/exploits/21849
- https://www.fortiguard.com/encyclopedia/ips/33335/zen-load-balancer-filelog-command-execution
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