CVE-2021-28861
python: open redirection vulnerability in lib/http/server.py may lead to information disclosure
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · August 22, 2022
Updated · November 1, 2026
Description
A vulnerability was found in python. This security flaw causes an open redirection vulnerability in lib/http/server.py due to no protection against multiple (/) at the beginning of the URI path. This issue may lead to information disclosure.
Statement
This vulnerability is rated as a moderate because in Python's http.server module, an input validation flaw in lib/http/server.py allows for an open redirection. This issue is triggered when a remote, unauthenticated attacker (Attack Vector: Network, Privileges Required: None) convinces a user to access a crafted URL that begins with two forward slashes (//) leads to an information disclosure.
Versions of python36:3.6/python36 as shipped with Red Hat Enterprise Linux 8 are marked as 'Not affected' as they just provide "symlinks" to the main python3 component, which provides the actual interpreter of the Python programming language.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
CWE-601 · URL Redirection to Untrusted Site