CVE-2021-3737

Summary

A flaw was found in python. An improperly handled HTTP response in the HTTP client code of python may allow a remote attacker, who controls the HTTP server, to make the client script enter an infinite loop, consuming CPU time. The highest threat from this vulnerability is to system availability.

Affected Software

Weaknesses

• CWE-835: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop'), CWE-400 - Uncontrolled Resource Consumption

ADP Enrichment

CVE Program Container

Additional References

• https://bugs.python.org/issue44022
• https://github.com/python/cpython/pull/25916
• https://bugzilla.redhat.com/show_bug.cgi?id=1995162
• https://github.com/python/cpython/pull/26503
• https://ubuntu.com/security/CVE-2021-3737
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html
• https://security.netapp.com/advisory/ntap-20220407-0009/
• https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
• https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
• https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html
• https://lists.debian.org/debian-lts-announce/2024/11/msg00024.html

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://bugs.python.org/issue44022
• https://github.com/python/cpython/pull/25916
• https://bugzilla.redhat.com/show_bug.cgi?id=1995162
• https://github.com/python/cpython/pull/26503
• https://ubuntu.com/security/CVE-2021-3737
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html
• https://security.netapp.com/advisory/ntap-20220407-0009/
• https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
• https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html

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