CVE-2025-56352
Quick assessment
Affected
n/a n/a
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
tinyMQTT是0x7C9A个人开发者的一个预排序树遍历算法库。 tinyMQTT存在资源管理错误漏洞，该漏洞源于CONNECT数据包解析期间协议违规处理不当，可能导致服务器端资源耗尽。以下版本受到影响：commit 6226ade15bd4f97be2d196352e64dd10937c1962版本。
Possible ATT&CK Techniques 2 AI
T1499 · Endpoint Denial of Service T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-56352
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In tinyMQTT commit 6226ade15bd4f97be2d196352e64dd10937c1962 (2024-02-18), the broker mishandles protocol violations during CONNECT packet parsing. When receiving a CONNECT packet with a zero-length Client ID while CleanSession is set to 0, the broker correctly replies with a CONNACK return code 0x02 (Identifier Rejected) but fails to explicitly close the TCP connection. Since the surrounding connection teardown logic is not guaranteed to execute, each such invalid CONNECT attempt leaves the underlying socket open. Repeated attempts cause server-side resource exhaustion due to accumulating file descriptors and memory usage, potentially resulting in denial of service.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
tinyMQTT 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
tinyMQTT是0x7C9A个人开发者的一个预排序树遍历算法库。 tinyMQTT存在资源管理错误漏洞，该漏洞源于CONNECT数据包解析期间协议违规处理不当，可能导致服务器端资源耗尽。以下版本受到影响：commit 6226ade15bd4f97be2d196352e64dd10937c1962版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | n/a | n/a | - |
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II. Public POCs for CVE-2025-56352
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · n/a · 2026-05-18 · 13 CVEs total
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IV. Related Vulnerabilities
V. Comments for CVE-2025-56352
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