dbcve.org
Lucene.netApplication · Apache

CVE-2024-43383

HIGH · 8.1 CVSS v3.1 Published 2024-10-31
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
90/100
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
Deserialization of Untrusted Data vulnerability in Apache Lucene.Net.Replicator. This issue affects Apache Lucene.NET's Replicator library: from 4.8.0-beta00005 through 4.8.0-beta00016. An attacker that can intercept traffic between a replication client and server, or control the target replication node URL, can provide a specially-crafted JSON response that is deserialized as an attacker-provided exception type. This can result in remote code execution or other potential unauthorized access. Users are recommended to upgrade to version 4.8.0-beta00017, which fixes the issue.

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

Apache Lucene.NET Replicator deserializes JSON responses without validating the exception type, allowing an attacker who controls the replication node URL or performs a man-in-the-middle attack to specify a malicious exception type for deserialization, leading to remote code execution.

MitigationUpgrade to Apache Lucene.NET Replicator version 4.8.0-beta00017 or later. Ensure TLS is enforced for all replication traffic to prevent interception.

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
Lucene.netApplication
Affected:= 4.8.0

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
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/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. Identify Apache Lucene.NET installation
    Locate the Lucene.NET assembly or NuGet package in your application dependencies, build output, or deployed binaries. Check your project file (e.g., .csproj), packages.config, or the bin directory for Lucene.Net.dll.
    Affected if Lucene.NET libraries are present in your environment
  2. Verify the exact version of Lucene.NET
    Check the version of the Lucene.Net.dll assembly (right-click > Properties > File Version) or the NuGet package version in your dependency manager. Compare the installed version to the affected range.
    Affected if The installed version is exactly 4.8.0
  3. Determine if Replicator component is in use
    Search your codebase, configuration files, and deployment artifacts for usage of Lucene.Net.Replicator namespace, classes such as Replicator, ReplicationClient, or related replication handlers. Check if your application configures or instantiates any Replicator-related objects.
    Affected if Your application uses or configures the Lucene.NET Replicator component
  4. Check replication endpoint configuration
    Inspect your application configuration files, connection strings, or replication settings for any configured replication node URLs or replication service endpoints.
    Affected if Replication node URLs are configured and reachable from your application
  5. Inspect network traffic protection for replication
    Examine your replication configuration or network settings to determine if TLS/SSL encryption is enforced for replication communication channels.
    Affected if Replication traffic does NOT use TLS encryption and the replication node URL is accessible to attackers

Your environment is affected if you have Apache Lucene.NET version 4.8.0 with the Replicator component enabled and replication traffic is unencrypted or the node URL is attacker-controllable.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade to Apache Lucene.NET Replicator version 4.8.0-beta00017 or later. Ensure TLS is enforced for all replication traffic to prevent interception.

Recommended fix High confidence

4.8.0-beta00017

  1. Check your project's current Apache Lucene.Net version in your .csproj file or packages.config
  2. Update the Lucene.Net package reference to version 4.8.0-beta00017 or later using NuGet package manager or by modifying the version number in your project file
  3. Run a NuGet restore to fetch the updated package
  4. Rebuild your solution to ensure compatibility with the new version
  5. Test your application's replication functionality to verify the upgrade works correctly
Caveat Review release notes for any breaking changes between beta versions

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

Fix this in Lucene.net Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing4.0 h
  • Review / QA2.0 h
9.0 hours of engineering $1,540
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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-2024-43383 in production — separate from our analysis above.

No notes yet

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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