CVE-2021-21240 Regular Expression Denial of Service in httplib2

2021-02-0819:45:19

CWE-400

GitHub_M

www.cve.org

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

0.004 Low

EPSS

Percentile

72.5%

JSON

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.

CNA Affected

[
  {
    "product": "httplib2",
    "vendor": "httplib2",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.19.0"
      }
    ]
  }
]