CVE-2021-28861

Description

Python 3.x through 3.10 has an open redirection vulnerability in lib/http/server.py due to no protection against multiple (/) at the beginning of URI path which may leads to information disclosure. NOTE: this is disputed by a third party because the http.server.html documentation page states "Warning: http.server is not recommended for production. It only implements basic security checks."

How to fix CVE-2021-28861

To remediate CVE-2021-28861, upgrade the affected package to a fixed version below.

• —upgrade to 3.7.14 or later
• —upgrade to 3.7.14 or later
• —upgrade to 3.7.14 or later
• —upgrade to 7.3.5+dfsg-2+deb11u4 or later
• —no fix listed
• —upgrade to 3.11.0~b4-1 or later
• —upgrade to 3.9.2-1+deb11u2 or later

Is CVE-2021-28861 being exploited?

Low — EPSS is 1.4%, meaning exploitation activity has not been observed at scale.

Affected packages (7)

• >= 3.0.0, < 3.7.14, >= 3.8.0, < 3.8.14, >= 3.9.0, < 3.9.14, >= 3.10.0, < 3.10.6
• >= 3.0.0, < 3.7.14, >= 3.8.0, < 3.8.14, >= 3.9.0, < 3.9.14, >= 3.10.0, < 3.10.6
• >= 3.0.0, < 3.7.14, >= 3.8.0, < 3.8.14, >= 3.9.0, < 3.9.14, >= 3.10.0, < 3.10.6
• from 0, < 7.3.5+dfsg-2+deb11u4
• from 0
• from 0, < 3.11.0~b4-1
• from 0, < 3.9.2-1+deb11u2

CVSS scores

References (22)

• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-28861
• WEBbugs.python.org/issue43223
• WEBgithub.com/python/cpython/pull/24848
• WEBgithub.com/python/cpython/pull/93879
• WEB