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I. Basic Information for CVE-2025-5399
Vulnerability Information

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Vulnerability Title
WebSocket endless loop
Source: NVD (National Vulnerability Database)
Vulnerability Description
Due to a mistake in libcurl's WebSocket code, a malicious server can send a particularly crafted packet which makes libcurl get trapped in an endless busy-loop. There is no other way for the application to escape or exit this loop other than killing the thread/process. This might be used to DoS libcurl-using application.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
libcurl 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libcurl是cURL开源的一个免费且易于使用的客户端 URL 传输库。 libcurl 8.13.0版本至8.14.0版本存在安全漏洞,该漏洞源于WebSocket代码错误处理不当,可能导致拒绝服务攻击。
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
VendorProductAffected VersionsCPESubscribe
curlcurl 8.14.0 ~ 8.14.0 -
II. Public POCs for CVE-2025-5399
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III. Intelligence Information for CVE-2025-5399
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IV. Related Vulnerabilities
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