Vulnerability details

CVE-2025-3857

Amazon Ion Dotnet

Infinite loop condition in Amazon.IonDotnet

CVSS 4.0

8.7High

Official description

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.

CVSS scores

Score	Version	Source	Vector
8.7High	4.0	CVEProject cvelistV5 (CNA) (AMZN)	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`
7.5High	3.1	CVEProject cvelistV5 (CNA) (AMZN)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
Amazon	Amazon Ion Dotnet	v < 1.3.1	CVEProject cvelistV5 (CNA)

References and advisories

https://aws.amazon.com/security/security-bulletins/AWS-2025-009/ vendor-advisory
https://github.com/amazon-ion/ion-dotnet/security/advisories/GHSA-gm2p-wf5c-w3pj third-party-advisory
https://github.com/amazon-ion/ion-dotnet/releases/tag/v1.3.1 patch

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Details

Published: 2025-04-21
Last updated: 2025-10-14
State: Published
Assigner (CNA): AMZN

Exploit prediction (EPSS)

0.62%

Probability of exploitation in 30 days

50%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-835
Loop with Unreachable Exit Condition ('Infinite Loop')
CWE-502
Deserialization of Untrusted Data