Security readout for executives and security teams
Plain-English summary
ZEN Load Balancer 2.0 and 3.0-rc1 can let a logged-in attacker run operating-system commands as root through a vulnerable log-viewing parameter. These versions are obsolete and unsupported, so any remaining deployment should be treated as a high-priority retirement or migration issue.
Executive priority
Treat this as urgent if affected systems remain in production. The business risk is full compromise of the load balancer as root, with potential traffic interception, outage, or lateral movement. Unsupported software raises remediation urgency.
Technical view
The flaw is CWE-78 command injection in content2-2.cgi. The filelog parameter is passed into a backtick-delimited exec() call without sanitization, enabling authenticated network attackers to achieve root-level remote code execution on affected ZEN Load Balancer versions.
Likely exposure
Exposure is likely limited to legacy ZEN Load Balancer 2.0 or 3.0-rc1 installations, especially internet- or broadly network-reachable administrative interfaces. Current ZEVENET or SKUDONET products are not listed as affected in the supplied sources.
Exploitation context
Public exploit references exist, including Rapid7 Metasploit and Exploit-DB entries. The source bundle does not show CISA KEV listing or other evidence of active exploitation, so active exploitation should not be assumed.
Researcher notes
This is an older 2012 disclosure assigned a newer CVE record. Sources support authenticated root RCE and public exploit availability, but not active exploitation. Evidence does not name a vendor patch for unsupported versions.
Mitigation direction
- Identify and retire ZEN Load Balancer 2.0 and 3.0-rc1 systems.
- Migrate to a supported load balancer platform or current maintained successor.
- Restrict administrative interface access to trusted management networks only.
- Review vendor or successor-project guidance for supported migration paths.
- Use IPS or monitoring coverage where available during decommissioning.
Validation and detection
- Inventory load balancers for ZEN Load Balancer 2.0 or 3.0-rc1.
- Confirm whether administrative interfaces are reachable from untrusted networks.
- Review authentication and administrative logs for unexpected access.
- Check whether vulnerable content2-2.cgi functionality is present.
- Verify retirement, isolation, or migration status for each legacy instance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2012-10039 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.4 (4.0)
- Known Exploited
- No
- Published
Vector: 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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
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——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
9.4CriticalVector: 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
Source materials
- CVE List V5 sourceCVE List V5
- https://web.archive.org/web/20221203195056/https://itsecuritysolutions.org/2012-09-21-ZEN-Load-Balancer-v2.0-and-v3.0-rc1-multiple-vulnerabilities/CVE reference · technical-description, exploit
- https://web.archive.org/web/20111015031540/http://www.zenloadbalancer.com/CVE reference · product
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/http/zen_load_balancer_exec.rbCVE reference · exploit
- https://www.exploit-db.com/exploits/21849CVE reference · exploit
- https://www.fortiguard.com/encyclopedia/ips/33335/zen-load-balancer-filelog-command-executionCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.