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CVE
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CVE-2021-3737Date: (C)2021-10-04   (M)2024-02-08


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.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 7.5CVSS Score : 7.1
Exploit Score: 3.9Exploit Score: 8.6
Impact Score: 3.6Impact Score: 6.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: MEDIUM
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: NONE
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: NONEAvailability: COMPLETE
Integrity: NONE 
Availability: HIGH 
  
Reference:
N/A
https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
https://bugs.python.org/issue44022
https://bugzilla.redhat.com/show_bug.cgi?id=1995162
https://github.com/python/cpython/pull/25916
https://github.com/python/cpython/pull/26503
https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html
https://security.netapp.com/advisory/ntap-20220407-0009/
https://ubuntu.com/security/CVE-2021-3737

CPE    3
cpe:/o:canonical:ubuntu_linux:18.04::~~lts~~~
cpe:/o:redhat:enterprise_linux:7.0
cpe:/a:python:python
CWE    1
CWE-400
OVAL    41
oval:org.secpod.oval:def:86361
oval:org.secpod.oval:def:506920
oval:org.secpod.oval:def:3300826
oval:org.secpod.oval:def:89045759
...

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