CVE-2020-13818
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 Zoho ManageEngine OpManager before 125144, when <cachestart> is used, directory traversal validation can be bypassed.
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 confidenceZoho ManageEngine OpManager before version 125144 contains a directory traversal vulnerability where the `<cachestart>` feature can be exploited to bypass validation checks, potentially allowing unauthorized file system access outside the intended web root.
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< 12.5= 12.5CVSS 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.
-
Identify the installed OpManager versionLocate the version information in the OpManager installation directory (typically in a version.txt, build.info, or within the product's About/Admin interface). Compare the version number to the affected range: versions less than 12.5 or exactly version 12.5 are vulnerable.Affected if The installed version is 12.5 or any version lower than 12.5 (for example, 12.4, 12.3, earlier releases).
-
Verify the cachestart functionality is accessibleDetermine whether the `<cachestart>` feature or its associated endpoint is enabled or accessible in the OpManager configuration. This may be found in the web interface settings, an XML configuration file, or through API accessibility.Affected if The `<cachestart>` feature is enabled or exposed, making it available for exploitation.
-
Inspect access logs for directory traversal attemptsReview OpManager access logs (typically found in the logs directory) for any requests involving path traversal patterns such as '../' or unusual file access via the cachestart functionality.Affected if Evidence exists of traversal attempts or unauthorized file access through the cachestart feature in the logs.
Your environment is affected if OpManager version is 12.5 or below AND the cachestart feature is accessible or enabled.
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 data12.5
Upgrade ManageEngine OpManager to version 125144 or later. If immediate patching is not feasible, disable or restrict the `<cachestart>` functionality until the update can be applied.
- Consultation4.0 h
- Implementation6.0 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 $4,544.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-13818 — 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-2020-13818 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data