CVE-2021-42261
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 · uneditedRevisor Video Management System (VMS) before 2.0.0 has a directory traversal vulnerability. Successful exploitation could allow an attacker to traverse the file system to access files or directories that are outside of restricted directory on the remote server. This could lead to the disclosure of sensitive data on the vulnerable server.
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 confidenceRevisor Video Management System before version 2.0.0 contains a directory traversal vulnerability that allows attackers to use path traversal sequences (such as ../) in user-supplied file path parameters to access files and directories outside the web root, potentially exposing sensitive system configuration files, credentials, or application source code.
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< 2.0.0CVSS 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
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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 Revisor VMS installed versionCheck the web interface footer, administration panel, or configuration files for version information. Look for files like version.php, config.xml, or system info pages that display the software version.Affected if The installed version is any version before 2.0.0 (e.g., 1.x.x or unversioned)
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Confirm web interface is accessibleVerify the Revisor VMS web interface is reachable via HTTP/HTTPS. The vulnerability is exploitable through user-supplied file path parameters in web requests.Affected if The web interface is exposed and accepts user input for file path parameters
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Inspect application logs for path traversal attemptsReview web server access logs and application logs for requests containing '../' sequences or unusual file path patterns targeting system directories (e.g., ../../etc/passwd, ../../windows.ini).Affected if Log entries show path traversal sequences in file path parameters or requests accessing files outside the web root
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Check for unauthorized file access indicatorsExamine web server logs and file system for unexpected access to sensitive files such as configuration files, credentials, or source code that should not be accessible via the web interface.Affected if Evidence exists of files being accessed outside the intended web root directory
The environment is affected if Revisor VMS version is below 2.0.0 and the web interface is accessible with user-controllable file path parameters, or if logs show path traversal exploitation attempts.
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 data2.0.0
Upgrade to Revisor VMS version 2.0.0 or later which contains the security fix. If immediate upgrade is not possible, implement input validation to reject path traversal sequences in file path parameters and enforce strict allow-list validation of requested file paths.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-42261 — 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-2021-42261 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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