CVE-2025-11573 - Denial of Service issue in Amazon.IonDotnet

unknownCVE-2025-11573

Bulletin ID: AWS-2025-022 Scope: Amazon Content Type: Important (requires attention) Publication Date: 2025/10/09 11:00 PM PDT Description: Amazon.IonDotnet is a library for the Dotnet language that is used to read and write Amazon Ion data. We identified CVE-2025-11573, which describes an infinite loop issue in Amazon.IonDotnet library versions <v1.3.2 that may allow a threat actor to cause a denial of service through a specially crafted text input. As of August 20, 2025, this library has been deprecated and will not receive further updates. Affected versions: <1.3.2

CSIRTS triage

vendor: Amazon product: Amazon.IonDotnet Denial of serviceaffected: <1.3.2

What: An infinite loop issue may allow denial of service through crafted input.
Who is affected: Users of Amazon.IonDotnet library versions earlier than 1.3.2.
Urgency: Remediation is urgent due to the potential for denial of service.
Action: Upgrade to version 1.3.2 or later.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: AWS Security Bulletins (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-06-05
Exploitation: Not in CISA KEV at last sync

Original advisory: https://aws.amazon.com/security/security-bulletins/rss/aws-2025-022/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2025-115730.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-11573	coverage & exploitation status	NVD · CVE.org

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