CVE-2024-47561Network attack vector

Unauthenticated code execution via unrestricted class resolution

Published Oct 3, 2024 · Updated Oct 21, 2024

Deserialization in Apache Avro Java SDK 1.11.3 and earlier allows remote attackers to execute arbitrary code through crafted schema data. SpecificData and ReflectData resolve class names from untrusted schemas without restricting allowed packages, enabling malicious classes to be instantiated during unmarshalling. Exposure requires an application to parse attacker-controlled schemas or Avro data with specific or reflection readers; successful exploitation runs code in the host JVM.

CVSS severity9.3
Critical
EPSS probability3.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Apache Avro Java SDK 1.11.3 and earlier allows remote attackers to execute arbitrary code through crafted schema data. SpecificData and ReflectData resolve class names from untrusted schemas without restricting allowed packages, enabling malicious classes to be instantiated during unmarshalling. Exposure requires an application to parse attacker-controlled schemas or Avro data with specific or reflection readers; successful exploitation runs code in the host JVM.

The record

CVE
CVE-2024-47561
Published
Oct 3, 2024
Updated
Oct 21, 2024
Vendor
The Apache Software Foundation
Product
Apache Avro
Classifications
CWE-502
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.11.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Avroversion=0 <1.11.4

Published CVSS scores

9.3GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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