CVE-2021-33503
Public on 2021-06-29
Modified on 2024-03-01
Description
A flaw was found in python-urllib3. When provided with a URL containing many @ characters in the authority component, the authority's regular expression exhibits catastrophic backtracking. This flaw causes a denial of service if a URL is passed as a parameter or redirected via an HTTP redirect. The highest threat from this vulnerability is to system availability.
Severity
Medium
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 1 | python-urllib3 | No Fix Planned | ||
| Amazon Linux 2 - Core | python-urllib3 | 2021-07-14 | ALAS2-2021-1688 | Fixed |
| Amazon Linux 2023 | python-urllib3 | Not Affected |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | CVSSv2 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| NVD | CVSSv3 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |