CVE-2021-42125
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 · uneditedAn unrestricted file upload vulnerability exists in Ivanti Avalanche before 6.3.3 allows an attacker with access to the Inforail Service to write dangerous files.
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 confidenceUnrestricted file upload vulnerability in Ivanti Avalanche versions before 6.3.3 allows an attacker with access to the Inforail Service to write dangerous files to the system, potentially leading to remote code execution.
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< 6.3.3CVSS 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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Confirm Ivanti Avalanche is installedIdentify whether Ivanti Avalanche software is present on the system using standard software inventory or product listing methodsAffected if Ivanti Avalanche is installed and running on the system
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Determine the installed version of Ivanti AvalancheLocate and read the version information for Ivanti Avalanche, typically found in the application itself, its installation directory, or system registryAffected if The installed version is earlier than 6.3.3 (e.g., 6.3.0, 6.2.x, or older)
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Verify the Inforail Service is accessibleCheck whether the Inforail Service component of Ivanti Avalanche is running and network-accessible, typically via service status check or port/service enumerationAffected if The Inforail Service is active and accessible to the attacker (even on internal networks)
The environment is affected if Ivanti Avalanche is installed with a version lower than 6.3.3 and the Inforail Service is accessible, allowing unrestricted file upload that could lead to remote code execution.
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.
dbcve · scoped6.3.3
Upgrade to Ivanti Avalanche 6.3.3 or later to patch the vulnerability. As a compensating control, restrict access to the Inforail Service to authorized personnel only.
6.3.3
- Backup the current Ivanti Avalanche installation and database before proceeding with the upgrade
- Download Ivanti Avalanche version 6.3.3 or later from the official Ivanti download portal or support site
- Stop the Avalanche services, including the Inforail Service
- Install the upgraded Avalanche 6.3.3 version following the standard upgrade documentation
- Restart all Avalanche services and verify the Inforail Service is running correctly
- Confirm the upgrade was successful by logging into the Avalanche admin console and checking the version information
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation4.0 h
- Testing6.0 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 $4,448.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-42125 — 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-2021-42125 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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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