CVE-2021-42130
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 deserialization of untrusted data vulnerability exists in Ivanti Avalanche before 6.3.3 allows an attacker with access to the Inforail Service to perform arbitrary 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 confidenceIvanti Avalanche before version 6.3.3 contains a deserialization vulnerability in the Inforail Service component. An attacker who gains access to this service can deserialize untrusted data, leading to arbitrary code execution on the affected system.
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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Verify Ivanti Avalanche installation and versionCheck installed programs, services, or the application directory for Ivanti Avalanche and note the exact version number installedAffected if Ivanti Avalanche is installed with a version lower than 6.3.3
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Confirm Inforail Service is present and runningCheck system services list or process list for the Inforail Service componentAffected if Inforail Service is installed and running on the system
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Identify Inforail Service network listenerUse netstat or similar tool to identify which port the Inforail Service is listening onAffected if Inforail Service is bound to a network port and accepting connections
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Assess network exposure of Inforail ServiceReview firewall rules and network access controls to determine if the Inforail Service port is accessible from untrusted network segmentsAffected if The Inforail Service port is reachable from untrusted or external network locations
The environment is affected if Ivanti Avalanche is installed with a version below 6.3.3 and the Inforail Service is running and network-accessible to untrusted parties.
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. Until patched, restrict network access to the Inforail Service to trusted personnel and systems only.
Ivanti Avalanche 6.3.3
- Identify the current Ivanti Avalanche version in use
- Confirm the Inforail Service is exposed (the vulnerability requires access to this service)
- Backup the current Avalanche configuration and database
- Upgrade Ivanti Avalanche to version 6.3.3 or later
- Verify the upgrade was successful by checking the version number
- Restart Avalanche services if not automatically done
- Confirm the Inforail Service is no longer vulnerable by verifying the version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,656.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-42130 — 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-2021-42130 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