ZEN Load Balancer Filelog Command Execution
Published Aug 11, 2025
9.4
CRITICALCVSS 4.0
EPSS 2.39%
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.
Affected products
-
- Version 2.0StatusaffectedConstraints-
- Version 3.0-rc1StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ZEN Load Balancer | ZEN Load Balancer | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
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
1 other source (NVD) ▾
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Aug 11, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2025–2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.39% (0.02389) | 83.35th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.45% (0.02451) | 82.22th | v5 (v2026.06.15) |
| Jun 7, 2026 | 67.18% (0.67181) | 98.58th | v4 (v2025.03.14) |
| Apr 27, 2026 | 47.85% (0.47846) | 97.72th | v4 (v2025.03.14) |
| Jan 8, 2026 | 43.63% (0.43626) | 97.39th | v4 (v2025.03.14) |
| Jan 7, 2026 | 50.18% (0.50175) | 97.72th | v4 (v2025.03.14) |
| Dec 11, 2025 | 61.02% (0.61015) | 98.22th | v4 (v2025.03.14) |
| Oct 18, 2025 | 63.10% (0.63104) | 98.29th | v4 (v2025.03.14) |
| Oct 8, 2025 | 60.43% (0.60432) | 98.18th | v4 (v2025.03.14) |
| Aug 12, 2025 | 0.53% (0.00527) | 66.11th | v4 (v2025.03.14) |
References (5)
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/http/zen_load_balancer_exec.rb exploit
- https://web.archive.org/web/20111015031540/http://www.zenloadbalancer.com/ product
- https://web.archive.org/web/20221203195056/https://itsecuritysolutions.org/2012-09-21-ZEN-Load-Balancer-v2.0-and-v3.0-rc1-multiple-vulnerabilities/ technical-descriptionexploit
- https://www.exploit-db.com/exploits/21849 exploit
- https://www.fortiguard.com/encyclopedia/ips/33335/zen-load-balancer-filelog-command-execution third-party-advisory
Change history (0)
No recorded changes yet.