CVE-2012-10039

CRITICALNVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under NVD CVSS v3. EPSS exploit probability: 67.2%, top 1% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Weaponized
9.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.4Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.4
EG Score
9.4(medium)
EPSS
82.2%
KEV
Not listed

Published

August 11, 2025

Last Modified

April 15, 2026

Advisory Details (5)

Auto-updated Jul 4, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Just a moment

https://www.fortiguard.com/encyclopedia/ips/33335/zen-load-balancer-filelog-command-execution
generic🟡 PoC Available

ZEN Load Balancer Filelog - Command Execution (Metasploit) - Unix remote Exploit

https://www.exploit-db.com/exploits/21849
generic🟡 PoC Available

ZEN Load Balancer v2.0 and v3.0-rc1 multiple vulnerabilities

https://web.archive.org/web/20221203195056/https://itsecuritysolutions.org/2012-09-21-ZEN-Load-Balancer-v2.0-and-v3.0-rc1-multiple-vulnerabilities/
generic

Zen Load Balancer V1 RC5 is released

https://web.archive.org/web/20111015031540/http://www.zenloadbalancer.com/
generic
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/http/zen_load_balancer_exec.rb

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 14:04 UTCEPSS rescore
  2. 2026-07-22 14:04 UTCEPSS rescore
  3. 2026-07-21 15:21 UTCEPSS rescore
  4. 2026-07-20 17:03 UTCEPSS rescore
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  6. 2026-07-19 14:27 UTCEPSS rescore
  7. 2026-07-19 02:25 UTCEPSS rescore
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  9. 2026-07-16 16:58 UTCEPSS rescore
  10. 2026-07-15 16:54 UTCEPSS rescore
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  15. 2026-07-11 08:22 UTCEPSS rescore
  16. 2026-07-09 19:05 UTCEPSS rescore
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  19. 2026-07-06 16:23 UTCEPSS rescore
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  21. 2026-07-06 02:19 UTCEPSS rescore
  22. 2026-07-05 02:26 UTCEPSS rescore
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  24. 2026-07-02 14:01 UTCEPSS rescore
  25. 2026-07-01 15:02 UTCEPSS rescore
Show 72 more
  1. 2026-06-30 23:19 UTCEPSS rescore
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  3. 2026-06-29 14:02 UTCEPSS rescore
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  5. 2026-06-28 04:53 UTCEPSS rescore
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  7. 2026-06-27 03:05 UTCEPSS rescore
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  9. 2026-06-25 13:46 UTCEPSS rescore
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  11. 2026-06-24 14:02 UTCEPSS rescore
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  17. 2026-06-19 19:22 UTCEPSS rescore
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  19. 2026-06-18 17:49 UTCEPSS rescore
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  21. 2026-06-17 17:49 UTCEPSS rescore
  22. 2026-06-17 17:49 UTCEPSS rescore
  23. 2026-06-16 17:49 UTCEPSS rescore
  24. 2026-06-16 17:49 UTCEPSS rescore
  25. 2026-06-15 17:44 UTCEPSS rescore
  26. 2026-06-14 23:14 UTCEPSS rescore
  27. 2026-06-14 23:14 UTCEPSS rescore
  28. 2026-06-12 23:08 UTCEPSS rescore
  29. 2026-06-11 13:56 UTCEPSS rescore
  30. 2026-06-10 22:14 UTCEPSS rescore
  31. 2026-06-10 13:18 UTCEPSS rescore
  32. 2026-06-08 15:47 UTCEG score recompute▲ 9.40
  33. 2026-06-08 15:47 UTCGHSA enrichment
  34. 2026-06-08 14:14 UTCEPSS rescore
  35. 2026-06-08 14:14 UTCEPSS rescore
  36. 2026-06-07 15:22 UTCEPSS rescore
  37. 2026-06-07 15:22 UTCEPSS rescore
  38. 2026-06-06 13:45 UTCEPSS rescore
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  40. 2026-06-05 22:44 UTCEPSS rescore
  41. 2026-06-05 22:44 UTCEPSS rescore
  42. 2026-06-05 06:08 UTCEPSS rescore
  43. 2026-06-05 06:08 UTCEPSS rescore
  44. 2026-06-04 13:09 UTCEPSS rescore
  45. 2026-06-02 20:10 UTCEPSS rescore
  46. 2026-06-02 20:10 UTCEPSS rescore
  47. 2026-05-31 22:28 UTCEPSS rescore
  48. 2026-05-31 22:28 UTCEPSS rescore
  49. 2026-05-31 00:14 UTCEPSS rescore
  50. 2026-05-31 00:14 UTCEPSS rescore
  51. 2026-05-29 13:41 UTCEPSS rescore
  52. 2026-05-28 13:42 UTCEPSS rescore
  53. 2026-05-28 13:42 UTCEPSS rescore
  54. 2026-05-27 13:38 UTCEPSS rescore
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  56. 2026-05-26 13:41 UTCEPSS rescore
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  58. 2026-05-26 07:16 UTCEPSS rescore
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  60. 2026-05-26 07:16 UTCEPSS rescore
  61. 2026-05-24 16:43 UTCEPSS rescore
  62. 2026-05-22 21:15 UTCEPSS rescore
  63. 2026-05-22 21:15 UTCEPSS rescore
  64. 2026-05-22 21:15 UTCEPSS rescore
  65. 2026-05-21 22:39 UTCEPSS rescore
  66. 2026-05-21 10:07 UTCEG score recompute
  67. 2026-05-21 10:07 UTCGHSA enrichment
  68. 2026-05-20 22:37 UTCEPSS rescore
  69. 2026-05-20 22:37 UTCEPSS rescore
  70. 2026-05-20 22:37 UTCEPSS rescore
  71. 2026-05-18 21:29 UTCEPSS rescore
  72. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/linux/http/zen_load_balancer_exec✓ verified
    First seen Sep 14, 2012

    ZEN Load Balancer Filelog Command Execution

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2012-10039?
CVE-2012-10039 is a critical vulnerability published on August 11, 2025. 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…
When was CVE-2012-10039 disclosed?
CVE-2012-10039 was first published in the National Vulnerability Database on August 11, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2012-10039 actively exploited?
CVE-2012-10039 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 82.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2012-10039?
CVE-2012-10039 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2012-10039?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2012-10039, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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