CVE-2020-7877
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 · uneditedA buffer overflow issue was discovered in ZOOK solution(remote administration tool) through processing 'ConnectMe' command while parsing a crafted OUTERIP value because of missing boundary check. This vulnerability allows the attacker to execute remote arbitrary command.
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 · moderate confidenceA buffer overflow vulnerability exists in ZOOK solution (remote administration tool) due to missing boundary checks when parsing the OUTERIP value during 'ConnectMe' command processing. The lack of input length validation on the OUTERIP parameter allows attackers to overflow the buffer and execute arbitrary commands remotely.
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= 2.0.6.1= 2.0.4.6CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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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Verify Zook software installationCheck system for installed Mastersoft Zook Agent or Zook Viewer applications by reviewing installed programs list or searching for Zook-related executables and directoriesAffected if Neither Zook Agent nor Zook Viewer is installed, then not affected
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Identify installed Zook versionLocate the installed Zook application and determine its exact version number (typically found in program properties, about dialog, or version info of the executable)Affected if Version is 2.0.6.1 for Zook Agent or 2.0.4.6 for Zook Viewer exactly
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Confirm ConnectMe feature availabilityVerify that the ConnectMe command functionality is present and accessible in the installed Zook applicationAffected if ConnectMe feature is present and can process the OUTERIP parameter
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Assess network exposure of Zook serviceDetermine if the Zook service is listening on network ports and accessible from external sources (review firewall rules and service binding configuration)Affected if Service is network-accessible and accepts ConnectMe commands with OUTERIP parameter
Affected only if Zook Agent version 2.0.6.1 or Zook Viewer version 2.0.4.6 is installed AND the ConnectMe command with OUTERIP parameter is available and accessible on the system or network
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 dataImplement strict input validation and boundary checking on the OUTERIP parameter before buffer operations. If available, apply vendor patches; otherwise, refactor the parsing logic to enforce maximum length limits and use safe string handling functions.
- Consultation3.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-7877 — 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-2020-7877 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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- Version or environment caveats, and links to real fixes
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