CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2021-21240
High (7.5) in httplib2 project httplib2. EPSS 3.6% chance of exploitation in the next 30 days. Fixed in httplib2 0.19.0.
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.
Severity
- EPSS
- 3.6% chance of exploitation in the next 30 days; higher than 89% of CVEs (scores of 2026-10-31)
- CWE
- CWE-400
- Published
- Modified
- Record from
- the NVD, synced
Affected
- httplib2_project:httplib2
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-93xj-8mrv-444m | PyPI | httplib2 | <0.19.0 | 0.19.0 |
| PYSEC-2021-16 | PyPI | httplib2 | <0.19.0 | 0.19.0 |
References
- https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc
- https://github.com/httplib2/httplib2/pull/182
- https://github.com/httplib2/httplib2/security/advisories/GHSA-93xj-8mrv-444m
- https://pypi.org/project/httplib2
- https://github.com/httplib2/httplib2/commit/bd9ee252c8f099608019709e22c0d705e98d26bc