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CVE-2021-28861

HIGHCVSS 7.4/10EPSS 1.99%

Last modified

CVE-2021-28861 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. 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. EPSS estimates a 1.99% chance of exploitation in the next 30 days.

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."

Metrics

CVSS 3.1
7.4/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

EPSS Probability
1.99%

78.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
PythonPython>= 3.0.0, < 3.7.14—
PythonPython>= 3.8.0, < 3.8.14—
PythonPython>= 3.9.0, < 3.9.14—
PythonPython>= 3.10.0, < 3.10.6—
PythonPython3.11.0Alpha1
FedoraprojectFedora35—
FedoraprojectFedora36—
FedoraprojectFedora37—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-28861?
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 severe is CVE-2021-28861?
CVE-2021-28861 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 1.99% probability of exploitation in the next 30 days.
How do I fix CVE-2021-28861?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28861?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST