CVE-2021-28861

Advisory lineage Upstream: 0 Downstream: 27
Modified
Published: 23 Aug 2022, 00:00
Last modified:17 Dec 2025, 21:30

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.4 HIGH
v3.1 (nvd)
EPSS Score
1.4% LOW
1% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

23 Aug 2022, 00:00
Published
Vulnerability first disclosed
17 Dec 2025, 21:30
Last Modified
Vulnerability information updated

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."

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
  • v3.1•HIGH•Score: 7.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

EPSS Trends

Current EPSS score: 1.40%• Percentile: 81%

Techniques & Countermeasures

  • CWE-601•URL Redirection to Untrusted Site ('Open Redirect')

    The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

Affected Systems

  • fedoraproject•fedora

    35 | 36 | 37

  • python•python

    ≥ 3.0.0, < 3.7.14 | ≥ 3.8.0, < 3.8.14 | ≥ 3.9.0, < 3.9.14 | ≥ 3.10.0, < 3.10.6 | 3.11.0:alpha1 | 3.11.0:alpha2 | 3.11.0:alpha3 | 3.11.0:alpha4 | 3.11.0:alpha5 | 3.11.0:alpha6 | 3.11.0:alpha7 | 3.11.0:beta1 | 3.11.0:beta2 | 3.11.0:beta3

References (20)