CVE-2025-11573
📋 TL;DR
This CVE describes an infinite loop vulnerability in Amazon.IonDotnet library versions before v1.3.2. Attackers can cause denial of service by sending specially crafted text input to applications using this library. Anyone using affected versions of Amazon.IonDotnet is vulnerable.
💻 Affected Systems
- Amazon.IonDotnet
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability due to resource exhaustion from infinite loop, potentially affecting multiple dependent services.
Likely Case
Targeted denial of service against specific endpoints or services that process Ion text input, causing temporary service disruption.
If Mitigated
Minimal impact with proper input validation and monitoring, though risk remains if vulnerable version is exposed.
🎯 Exploit Status
Exploitation requires sending specially crafted text input to vulnerable endpoints. No authentication needed if input processing is exposed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.3.2
Vendor Advisory: https://github.com/amazon-ion/ion-dotnet/security/advisories/GHSA-q5r6-9qwq-g2wj
Restart Required: Yes
Instructions:
1. Update NuGet package reference to Amazon.IonDotnet v1.3.2. 2. Rebuild and redeploy affected applications. 3. Restart services using the updated library.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict input validation and size limits for Ion text processing endpoints
Rate limiting and monitoring
allApply rate limiting to endpoints processing Ion text and monitor for abnormal resource usage
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block suspicious Ion text patterns
- Isolate vulnerable services behind reverse proxies with request filtering and timeouts
🔍 How to Verify
Check if Vulnerable:
Check project dependencies for Amazon.IonDotnet version < 1.3.2 via NuGet package manager or project filesCheck Version:
dotnet list package | findstr Amazon.IonDotnetVerify Fix Applied:
Confirm Amazon.IonDotnet version is >= 1.3.2 in package references and deployed binaries📡 Detection & Monitoring
Log Indicators:
- High CPU usage spikes
- Application hangs or timeouts
- OutOfMemoryException logs
- Request processing taking abnormally long
Network Indicators:
- Repeated requests with similar Ion text payloads
- Unusually large text payloads to Ion processing endpoints
SIEM Query:
source="application_logs" AND ("high cpu" OR "timeout" OR "hang") AND process_name="*ion*"