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Vulnerabilities

Vulnerability · CVE-2012-10039

ZEN Load Balancer versions 2.0 and 3.0-rc1 contain a command injection vulnerability in content2-2.cgi.

Published Aug 11, 2025 · catalog updated Apr 7, 2026 · ZEN Load Balancer ZEN Load Balancer

Last checked Oct 24, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2012-10039. EPSS is 3.42%. Act only if a listed version of ZEN Load Balancer ZEN Load Balancer is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
3.42%
Remediation
Advisory link
Affected products
vendor ZEN Load Balancer ZEN Load Balancer 2.0

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor ZEN Load Balancer ZEN Load Balancer 2.02.0

How to fix CVE-2012-10039

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2012-10039. EPSS is 3.42%. Act only if a listed version of ZEN Load Balancer ZEN Load Balancer is installed.

Which versions are affected?

Compare what you have installed with ZEN Load Balancer ZEN Load Balancer 2.0 2.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 3.42%. There is no CISA KEV listing. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 11, 2025 · EUVD

    Detected

    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 versio

  2. Apr 7, 2026 · EUVD

    Updated

    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 versio

Sources

  • CVE.orgVulnerability recordCVE-2012-10039

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2012-10039

    30-day exploitation probability 3.42%

    first.org
  • EUVDVulnerability recordEUVD-2012-6599

    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 r

    euvd.enisa.europa.eu
  • Metasploit ModulesPublic exploit moduleexploit_linux/http/zen_load_balancer_exec

    Public module reference (excellent). Module source is not copied into this catalog.

    rapid7.com

References

Freshness

Last verified in this catalog Oct 24, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 24, 2026
  • Metasploit ModulesOct 23, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 20, 2026