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.NET
.NET NuGet
Not in CISA KEV
HIGH severity

CVE-2024-43383 — Lucene.Net.Replicator

HIGHFix: apache/lucenenet@1f61dd0

CVE-2024-43383 is a high-severity (CVSS 8) Deserialization of Untrusted Data vulnerability in Lucene.Net.Replicator. A fix is available for Lucene.Net.Replicator — see the affected versions and patch details below.

Apache Lucene.Net.Replicator: Remote Code Execution in Lucene.Net.Replicator

Also known asGHSA-2qw8-ppr5-m96c
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • A successful exploit gives an attacker total control of the affected component, not partial access.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2024-43383.

EPSS Exploitation Probability

via FIRST.org ↗
1.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs68th percentile — riskier than 68% of all scored CVEsHighest risk
0.13%2.01%3.90%5.79%4.7%1.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
.NETLucene.Net.Replicator

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetLucene.Net.Replicator≥ 4.8.0-beta00005&&< 4.8.0-beta000174.8.0-beta00017dotnet add package Lucene.Net.Replicator --version 4.8.0-beta00017

Affected Products

1 product · 12 configurations
Application
lucene.netapache
1 version
4.8.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Lucene.Net.Replicator, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update Lucene.Net.Replicator to 4.8.0-beta00017 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-43383 is resolved across your whole dependency graph.

  3. Workarounds

    Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2024-43383: Lucene.Net RCE — Fix Available