CVE-2021-21240

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.

How to fix CVE-2021-21240

To remediate CVE-2021-21240, upgrade the affected package to a fixed version below.

• —no fix listed
• —upgrade to 0.19.0 or later
• —upgrade to bd9ee252c8f099608019709e22c0d705e98d26bc or later

Is CVE-2021-21240 being exploited?

Low — EPSS is 2.0%, meaning exploitation activity has not been observed at scale.

Affected packages (3)

• from 0
• from 0, < 0.19.0
• from 0, < bd9ee252c8f099608019709e22c0d705e98d26bc | from 0, < 0.19.0

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-21240
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-21240
• PATCHgithub.com/httplib2/httplib2
• WEBgithub.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc
• WEB