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CVE-2025-11573

Denial of Service issue in Amazon.IonDotnet

HIGH

7.5

CVSS Score

Published: October 9, 2025 at 05:48 PM UTC

Updated: October 23, 2026 at 10:10 PM UTC

1 product affected across 1 vendorIon .NET

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Severity

HIGH7.5

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

An infinite loop issue in Amazon.IonDotnet library versions <v1.3.2 may allow a threat actor to cause a denial of service through a specially crafted text input. To mitigate this issue, users should upgrade to version v1.3.2. As of August 20, 2025, this library has been deprecated and will not receive further updates.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ion .NET · Amazon

90%

0 ≤ v < 1.3.20

Affected range stops below 1.3.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

PatchProduct

Source: cverecord

https://github.com/amazon-ion/ion-dotnet/releases/tag/v1.3.2

Vendor Advisory

Source: cverecord

https://aws.amazon.com/security/security-bulletins/AWS-2025-022/

Third Party Advisory

Source: cverecord

https://github.com/amazon-ion/ion-dotnet/security/advisories/GHSA-q5r6-9qwq-g2wj

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHAMZN

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-1286

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