CVE-2021-42129
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 command injection vulnerability exists in Ivanti Avalanche before 6.3.3 allows an attacker with access to the Inforail Service to perform arbitrary command 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 confidenceA command injection vulnerability exists in Ivanti Avalanche before version 6.3.3, specifically within the Inforail Service component. An attacker who gains access to the Inforail Service can inject and execute arbitrary operating system commands due to insufficient input sanitization.
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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Identify if Ivanti Avalanche is installedCheck for Ivanti Avalanche installation directories (typically under C:\Program Files\Ivanti or C:\Program Files (x86)\Ivanti) or look in Windows Add/Remove Programs for Ivanti Avalanche.Affected if Ivanti Avalanche is found installed on the system.
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Determine the installed version of Ivanti AvalancheLocate the Avalanche server or client version information - commonly found in the application executable properties, an About dialog, or version file within the installation directory (e.g., look for Avalanche.exe or version.xml).Affected if The installed version cannot be determined or is displayed.
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Verify the Inforail Service is presentOpen Windows Services (services.msc) and look for a service named 'Inforail', 'Inforail Service', or similar, or check the Windows services list via command: sc query type= service state= all | findstr -i inforail.Affected if An Inforail Service is listed and running on the system.
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Compare the installed version against the vulnerable rangeCompare the identified version number to the affected range: any version of Ivanti Avalanche below 6.3.3 is vulnerable. The version format typically appears as major.minor.build (e.g., 6.3.0, 6.2.1).Affected if The installed Ivanti Avalanche version is below 6.3.3.
The system is affected if Ivanti Avalanche is installed with a version lower than 6.3.3 and the Inforail Service component is present and 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.
dbcve · scoped6.3.3
Upgrade Ivanti Avalanche to version 6.3.3 or later to remediate the command injection vulnerability in the Inforail Service. Restrict access to the Inforail Service to trusted personnel only until the patch is applied.
Ivanti Avalanche 6.3.3
- Back up the current Ivanti Avalanche installation and its database before proceeding with the upgrade
- Download Ivanti Avalanche version 6.3.3 or later from the official Ivanti support portal or download center
- Follow the official Ivanti Avalanche upgrade documentation to install version 6.3.3
- After upgrade, verify the Inforail Service is running correctly and the application functions normally
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-42129 — 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-2021-42129 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
- No spam, self-promotion, credentials, or personal data