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CVE-2025-3857

Good to know:

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Date: April 21, 2025

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.

Severity Score

Related Resources (7)

https://aws.amazon.com/security/security-bulletins/AWS-2025-009
https://github.com/amazon-ion/ion-dotnet/security/advisories/GHSA-gm2p-wf5c-w3pj
https://nvd.nist.gov/vuln/detail/CVE-2025-3857
https://aws.amazon.com/security/security-bulletins/AWS-2025-009/
https://github.com/amazon-ion/ion-dotnet/commit/34a4f5215eceac1bb7bf434c4f2310d64d1b703b
https://github.com/amazon-ion/ion-dotnet
https://www.mend.io/vulnerability-database/CVE-2025-3857

Severity Score

Weakness Type (CWE)

Deserialization of Untrusted Data

CWE-502

Loop with Unreachable Exit Condition ('Infinite Loop')

CWE-835

Top Fix

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Upgrade Version

Upgrade to version Amazon.IonDotnet - 1.3.1;Amazon.IonDotnet - 1.3.1;https://github.com/amazon-ion/ion-dotnet.git - v1.3.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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