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I. Basic Information for CVE-2021-21240
Vulnerability Information

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Vulnerability Title
Regular Expression Denial of Service in httplib2
Source: NVD (National Vulnerability Database)
Vulnerability Description
httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0, a malicious server which responds with long series of "\xa0" characters in the "www-authenticate" header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server. This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
httplib2 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
httplib2是一款HTTP客户端库。 httplib2 0.19.0之前的版本中存在安全漏洞,该漏洞源于在 www-authenticate 报头中响应长串 xa0 字符可能会导致httpplib2客户端访问该服务器时拒绝服务。
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
httplib2httplib2 < 0.19.0 -
II. Public POCs for CVE-2021-21240
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III. Intelligence Information for CVE-2021-21240
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IV. Related Vulnerabilities
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