CVE-2021-3737
HIGH severity · CVSS 7.5 · CWE-835
7.5CVSS HIGH
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)12%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://bugzilla.redhat.com/show_bug.cgi?id=1995162 ↗
Additional information
- NVD record
- https://bugzilla.redhat.com/show_bug.cgi?id=1995162Patch
- https://github.com/python/cpython/pull/25916Patch
- https://github.com/python/cpython/pull/26503Patch
- https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.htmlPatch
- https://bugs.python.org/issue44022Advisory
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- https://security.netapp.com/advisory/ntap-20220407-0009/Advisory