CVE-2024-21634Network attack vector

Application crash via recursive Ion data processing

Published Jan 3, 2024 · Updated Nov 3, 2025

Denial of service in Amazon Ion Java before 1.10.5 allows remote attackers to crash affected applications with crafted Ion data. While parsing Ion text or traversing an IonValue model, library processing follows crafted nested structures deeply enough to exhaust the Java call stack. Reachability requires a consuming application to accept untrusted Ion data and, for binary input, invoke an affected IonValue method; the bounded consequence is service interruption.

CVSS severity7.5
High
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Amazon Ion Java before 1.10.5 allows remote attackers to crash affected applications with crafted Ion data. While parsing Ion text or traversing an IonValue model, library processing follows crafted nested structures deeply enough to exhaust the Java call stack. Reachability requires a consuming application to accept untrusted Ion data and, for binary input, invoke an affected IonValue method; the bounded consequence is service interruption.

The record

CVE
CVE-2024-21634
Published
Jan 3, 2024
Updated
Nov 3, 2025
Vendor
Amazon Ion
Product
Ion Java
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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=< 1.10.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Amazon Ion · Ion Javaversion=< 1.10.5

Published CVSS scores

7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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