{"id":86238,"date":"2026-01-08T23:20:24","date_gmt":"2026-01-08T23:20:24","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T00:00:00","slug":"cve-2025-3857-critical-denial-of-service-vulnerability-in-amazon-iondotnet","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-3857-critical-denial-of-service-vulnerability-in-amazon-iondotnet\/","title":{"rendered":"CVE-2025-3857: Critical Denial of Service Vulnerability in Amazon.IonDotnet<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

CVE-2025-3857 is a severe vulnerability in Amazon.IonDotnet’s RawBinaryReader class that could potentially lead to system compromise or data leakage. This vulnerability affects applications using Amazon.IonDotnet for reading binary Ion data, and it poses a significant risk due to its potential to trigger an infinite loop condition, resulting in a denial of service.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-3857
\nSeverity: High, CVSS 7.5
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: System compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Amazon.IonDotnet | All versions prior to 1.3.1<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit for this vulnerability involves sending malformed or truncated Ion data to an application using Amazon.IonDotnet. The lack of checks on the number of bytes read from the underlying stream while deserializing the binary format results in an infinite loop condition. This situation can cause system resources to be exhausted, leading to a denial of service. Additionally, in some cases, this vulnerability could be leveraged to compromise the system or leak data.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here’s a conceptual example of a malicious payload that could potentially exploit this vulnerability:<\/p>\n

POST \/api\/parse_ion HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/ion\n{\n\"malformed_ion_data\": \"...\"\n}<\/code><\/pre>\n
In this example, “malformed_ion_data” would contain Ion data that is purposely malformed or truncated to exploit the vulnerability.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
Users are advised to upgrade to Amazon.IonDotnet version 1.3.1 to mitigate this vulnerability. If an immediate upgrade is not possible, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could serve as a temporary mitigation measure. Ensure any forked or derivative code is patched to incorporate the new fixes.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview CVE-2025-3857 is a severe vulnerability in Amazon.IonDotnet’s RawBinaryReader class that could potentially lead to system compromise or data leakage. This vulnerability affects applications using Amazon.IonDotnet for reading binary Ion data, and it poses a significant risk due to its potential to trigger an infinite loop condition, resulting in a denial of service. Vulnerability Summary […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-86238","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t