CVE-2020-7839
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIn MaEPSBroker 2.5.0.31 and prior, a command injection vulnerability caused by improper input validation checks when parsing brokerCommand parameter.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA command injection vulnerability exists in MaEPSBroker versions 2.5.0.31 and prior. The brokerCommand parameter is not properly validated before being processed, allowing an attacker to inject arbitrary OS commands. This is exploitable remotely without authentication due to the lack of input sanitization.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data<= 2.5.0.31CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify if MaEPSBroker is installedSearch for MaEPSBroker installation directories, services, or processes on the system. Check common installation paths such as C:\Program Files\Markany\ or /opt/markany/ on Linux systems. Also query running services for 'MaEPSBroker' or 'maepsbroker' using system commands like sc query or systemctl.Affected if MaEPSBroker software is found running or installed on the system
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Determine installed versionLocate version information in the MaEPSBroker installation directory. Check for version files, executable properties, or service information. Common locations include the main executable file properties, a version.txt file, or the service metadata.Affected if The installed version is 2.5.0.31 or any version lower than 2.5.0.31
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Check if web/API interface is exposedIdentify if MaEPSBroker exposes a web service or API endpoint that accepts the brokerCommand parameter. Review network configuration files, service configurations, or IIS/apache settings associated with MaEPSBroker. Check for open ports typically used by the broker service.Affected if The MaEPSBroker HTTP service or API endpoint is accessible and accepts external input for the brokerCommand parameter
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Inspect input validation configurationExamine MaEPSBroker configuration files for any existing input validation, sanitization, or whitelisting rules applied to the brokerCommand parameter. Look for configuration files in the etc/ or config/ subdirectory of the installation.Affected if No input validation or sanitization is configured for the brokerCommand parameter, or validation is missing entirely
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Review access controlsCheck network ACLs, firewall rules, or application-level access controls that restrict access to the MaEPSBroker service. Determine if the service is accessible from untrusted networks without authentication.Affected if The MaEPSBroker service is exposed to untrusted networks or allows unauthenticated access
The environment is affected if MaEPSBroker version 2.5.0.31 or lower is installed and the brokerCommand parameter interface is accessible without authentication or input validation.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpgrade MaEPSBroker to a version newer than 2.5.0.31. If immediate patching is not possible, implement strict input validation and whitelisting on the brokerCommand parameter, and restrict network access to the broker service.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2020-7839 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-7839 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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