vulnerability
Arch Linux: Denial of service (CVE-2021-21240)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:N/AC:L/Au:N/C:N/I:N/A:P) | Feb 8, 2021 | Jul 11, 2025 | Nov 27, 2025 |
Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:P)
Published
Feb 8, 2021
Added
Jul 11, 2025
Modified
Nov 27, 2025
Description
In python-httplib2 before version 0.19.0, a malicious server which responds with a 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.
Solution
arch-linux-upgrade-latest
References
- CVE-2021-21240
- https://attackerkb.com/topics/CVE-2021-21240
- URL-https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc
- URL-https://github.com/httplib2/httplib2/pull/182
- URL-https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m
- URL-https://pypi.org/project/httplib2
- URL-https://security.archlinux.org/ASA-202102-35
- CWE-400
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