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Vulnerabilities

Security fix · CVE-2025-3857

When reading binary Ion data through Amazon.IonDotnet using the RawBinaryReader class, Amazon.IonDotnet does not check the number of bytes read from the underlying stream while des

Published Apr 21, 2025 · catalog updated Oct 14, 2025 · Amazon Amazon Ion Dotnet

Check if you run it

No confirmed exploitation is on record for CVE-2025-3857. EPSS is 0.61%. Act only if a listed version of Amazon Amazon Ion Dotnet is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.61%
Remediation
Version ranges on file
Affected products
vendor Amazon Amazon Ion Dotnet 0 <1.3.1

When reading binary Ion data through Amazon.IonDotnet using the RawBinaryReader class, Amazon.IonDotnet does not check the number of bytes read from the underlying stream while deserializing the binary format. If the Ion data is malformed or truncated, this triggers an infinite loop condition that could potentially result in a denial of service. Users should upgrade to Amazon.IonDotnet version 1.3.1 and ensure any forked or derivative code is patched to incorporate the new fixes.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Amazon Amazon Ion Dotnet 0 <1.3.10 <1.3.1

How to fix CVE-2025-3857

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-3857. EPSS is 0.61%. Act only if a listed version of Amazon Amazon Ion Dotnet is installed.

Which versions are affected?

Compare what you have installed with Amazon Amazon Ion Dotnet 0 <1.3.1 0 <1.3.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.61%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 21, 2025 · EUVD

    Detected

    When reading binary Ion data through Amazon.IonDotnet using the RawBinaryReader class, Amazon.IonDotnet does not check the number of bytes read from the underlying stream while deserializing the binary format. If the Ion data is malformed or truncated, this triggers an infinite loop condition that could potentially result in a denial of service. Users should upgrade to Amazon.IonDotnet version 1.3

  2. Oct 14, 2025 · EUVD

    Updated

    When reading binary Ion data through Amazon.IonDotnet using the RawBinaryReader class, Amazon.IonDotnet does not check the number of bytes read from the underlying stream while deserializing the binary format. If the Ion data is malformed or truncated, this triggers an infinite loop condition that could potentially result in a denial of service. Users should upgrade to Amazon.IonDotnet version 1.3

Sources

  • CVE.orgVulnerability recordCVE-2025-3857

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-3857

    30-day exploitation probability 0.6%

    first.org
  • EUVDVulnerability recordEUVD-2025-12229

    When reading binary Ion data through Amazon.IonDotnet using the RawBinaryReader class, Amazon.IonDotnet does not check the number of bytes read from the underlying stream while deserializing the binary format. If the Ion data is malformed or truncated, this triggers an infinite l

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.