What is CVE-2024-43383?

CVE-2024-43383 is a high-severity insecure deserialization vulnerability in Lucene.Net.Replicator (nuget), affecting versions >= 4.8.0-beta00005, < 4.8.0-beta00017. It is fixed in 4.8.0-beta00017. Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect.

How severe is CVE-2024-43383?

CVE-2024-43383 has a CVSS score of 8.0 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which versions of Lucene.Net.Replicator are affected by CVE-2024-43383?

Lucene.Net.Replicator (nuget) versions >= 4.8.0-beta00005, < 4.8.0-beta00017 is affected.

Is there a fix for CVE-2024-43383?

Yes. CVE-2024-43383 is fixed in 4.8.0-beta00017. Upgrade to this version or later.

Is CVE-2024-43383 exploitable, and should I be worried?

Whether CVE-2024-43383 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether CVE-2024-43383 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

CVE-2024-43383 in Lucene.Net.Replicator

Q: How severe is CVE-2024-43383?

CVE-2024-43383 has a CVSS score of 8.0 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Q: Which versions of Lucene.Net.Replicator are affected by CVE-2024-43383?

Lucene.Net.Replicator (nuget) versions >= 4.8.0-beta00005, < 4.8.0-beta00017 is affected.

Q: Is there a fix for CVE-2024-43383?

Yes. CVE-2024-43383 is fixed in 4.8.0-beta00017. Upgrade to this version or later.

Q: Is CVE-2024-43383 exploitable, and should I be worried?

Whether CVE-2024-43383 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

Q: What actually determines whether CVE-2024-43383 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

Q: How do I fix CVE-2024-43383?

Upgrade Lucene.Net.Replicator to 4.8.0-beta00017 or later.

Summary

Apache Lucene.Net.Replicator Deserialization of Untrusted Data vulnerability

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.

Impact

Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect. Typical impact: arbitrary code execution or logic abuse.

CVE-2024-43383 has a CVSS score of 8.0 (High). The vector is reachable from an adjacent network, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (4.8.0-beta00017); upgrading removes the vulnerable code path.

Affected versions

Lucene.Net.Replicator (>= 4.8.0-beta00005, < 4.8.0-beta00017)

Security releases

Lucene.Net.Replicator → 4.8.0-beta00017 (nuget)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

Upgrade Lucene.Net.Replicator to 4.8.0-beta00017 or later to resolve this vulnerability.

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently Asked Questions

What is CVE-2024-43383? CVE-2024-43383 is a high-severity insecure deserialization vulnerability in Lucene.Net.Replicator (nuget), affecting versions >= 4.8.0-beta00005, < 4.8.0-beta00017. It is fixed in 4.8.0-beta00017. Untrusted serialized data is processed by a deserializer that can instantiate arbitrary objects or execute code as a side effect.
How severe is CVE-2024-43383? CVE-2024-43383 has a CVSS score of 8.0 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Which versions of Lucene.Net.Replicator are affected by CVE-2024-43383? Lucene.Net.Replicator (nuget) versions >= 4.8.0-beta00005, < 4.8.0-beta00017 is affected.
Is there a fix for CVE-2024-43383? Yes. CVE-2024-43383 is fixed in 4.8.0-beta00017. Upgrade to this version or later.
Is CVE-2024-43383 exploitable, and should I be worried? Whether CVE-2024-43383 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether CVE-2024-43383 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
How do I fix CVE-2024-43383? Upgrade Lucene.Net.Replicator to 4.8.0-beta00017 or later.