CVE-2021-33503

2021-06-2900:00:00

ubuntu.com

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

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

0.003 Low

EPSS

Percentile

68.8%

JSON

An issue was discovered in urllib3 before 1.26.5. When provided with a URL
containing many @ characters in the authority component, the authority
regular expression exhibits catastrophic backtracking, causing a denial of
service if a URL were passed as a parameter or redirected to via an HTTP
redirect.

Notes

Author	Note
mdeslaur	the python-pip package bundles python-urllib3 binaries when built. After updating python-urllib3, a no-change rebuild of python-pip is required.
sbeattie	python-pip 20.3.4-4 build in impish is built against python3-urllib3 1.26.5-1~exp1, and thus impish and newer is fixed. introduced in urllib3 in 0aa3e24fcd75f1bb59ab159e9f8adb44055b2271 or newer

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchpython-pip< 20.0.2-5ubuntu1.7UNKNOWN
ubuntu20.04noarchpython-urllib3< 1.25.8-2ubuntu0.2UNKNOWN