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Manageengine Eventlog AnalyzerApplication · Zohocorp

CVE-2021-28959

CRITICAL · 9.8 CVSS v3.1 Published 2021-04-30
Fix available
A fix is available. Upgrade to 12.1.4 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
Zoho ManageEngine Eventlog Analyzer through 12147 is vulnerable to unauthenticated directory traversal via an entry in a ZIP archive. This leads to remote code execution.

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 confidence

Zoho ManageEngine Eventlog Analyzer versions through 12147 contain an unauthenticated directory traversal vulnerability in ZIP archive processing. Attackers can embed directory traversal sequences (e.g., ../../) in filenames within a crafted ZIP file, causing the application to write files to arbitrary locations on the server, leading to remote code execution.

MitigationApply vendor patch (upgrade to version 12148 or later) and implement network segmentation to restrict access to the ManageEngine Eventlog Analyzer interface until the patch is deployed.

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
Manageengine Eventlog AnalyzerApplication
Affected:< 12.1.4= 12.1.4

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Verify ManageEngine EventLog Analyzer is installed
    Locate the EventLog Analyzer installation directory or check running services for 'EventLog Analyzer' process
    Affected if The product is not installed, this CVE does not apply
  2. Determine the installed version
    Check the version number within the product interface or in version-related files within the installation directory
    Affected if The installed version is 12.1.4 or earlier (versions through 12.1.4 are affected)
  3. Confirm network accessibility of the web interface
    Verify if the EventLog Analyzer web interface is accessible from network segments, as this is an unauthenticated vulnerability
    Affected if The web interface is exposed to untrusted networks without authentication restrictions
  4. Check if ZIP import functionality is enabled
    Verify that the product has the ZIP archive import or log file upload feature available, which is the attack vector for this vulnerability
    Affected if ZIP import/upload capability is present and processing files without additional validation

You are affected if ManageEngine EventLog Analyzer is running and the installed version is 12.1.4 or earlier while the web interface is network-accessible and ZIP import features are enabled.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

dbcve · scoped
Upgrade available Upgrade to 12.1.4 or later
Fixed in 12.1.4
Interim mitigation

Apply vendor patch (upgrade to version 12148 or later) and implement network segmentation to restrict access to the ManageEngine Eventlog Analyzer interface until the patch is deployed.

Recommended fix Moderate confidence

Version 12.2 or later (ensure build is higher than 12147)

  1. 1. Back up your current Eventlog Analyzer installation and database before proceeding with any upgrade.
  2. 2. Download the latest version of ManageEngine Eventlog Analyzer from the official ManageEngine download page: https://www.manageengine.com/products/eventlog/
  3. 3. Stop the Eventlog Analyzer service before upgrading.
  4. 4. Install or upgrade to the latest available version (ensure it is version 12.2 or higher, which contains the fix for this vulnerability).
  5. 5. After upgrade, verify that the service starts successfully.
  6. 6. Test that the web interface is accessible and functioning properly.
  7. 7. Review audit logs to ensure no unauthorized access occurred during the vulnerability window.
Caveat Review release notes for any configuration or feature changes between 12.1.4 and the target upgrade version

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Manageengine Eventlog Analyzer Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,080
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,328.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-28959 in production — separate from our analysis above.

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What this is

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.

What belongs here
  • 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