{"cve":"CVE-2021-3737","nvd":{"published":"2022-03-04T19:15:08.730","modified":"2026-10-14T10:17:47.917","status":"Modified","description":"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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400","CWE-835"],"references":["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://lists.debian.org/debian-lts-announce/2023/05/msg00024.html"],"products":["canonical:ubuntu_linux","fedoraproject:fedora","netapp:hci","netapp:management_services_for_element_software","netapp:netapp_xcp_smb","netapp:ontap_select_deploy_administration_utility","netapp:xcp_nfs","oracle:communications_cloud_native_core_binding_support_function","oracle:communications_cloud_native_core_network_exposure_function","oracle:communications_cloud_native_core_policy","python:python","redhat:codeready_linux_builder","redhat:codeready_linux_builder_for_ibm_z_systems","redhat:codeready_linux_builder_for_power_little_endian","redhat:enterprise_linux","redhat:enterprise_linux_for_ibm_z_systems","redhat:enterprise_linux_for_power_little_endian"],"source":"nvd","synced_at":"2026-10-19T21:28:04.509275555+00:00"},"epss":{"cve":"CVE-2021-3737","score":0.13166,"percentile":0.96334,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}