Search for vulnerabilities
Vulnerability details: VCID-hq7h-468r-aaad
Vulnerability ID VCID-hq7h-468r-aaad
Aliases 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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-400 Uncontrolled Resource Consumption
CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
System Score Found at
rhas Moderate https://access.redhat.com/errata/RHSA-2021:4160
rhas Moderate https://access.redhat.com/errata/RHSA-2022:1663
rhas Moderate https://access.redhat.com/errata/RHSA-2022:1764
rhas Moderate https://access.redhat.com/errata/RHSA-2022:1821
rhas Moderate https://access.redhat.com/errata/RHSA-2022:1986
cvssv3 6.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3737.json
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00104 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.0012 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00124 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00124 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00124 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00124 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00124 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00124 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.00498 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01105 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01105 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01105 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01105 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01559 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01652 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01652 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01652 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01652 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01652 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01652 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01652 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
epss 0.01652 https://api.first.org/data/v1/epss?cve=CVE-2021-3737
rhbs low https://bugzilla.redhat.com/show_bug.cgi?id=1995162
cvssv3.1 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.1 https://nvd.nist.gov/vuln/detail/CVE-2021-3737
cvssv3 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-3737
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-3737
cvssv3.1 7.5 https://www.oracle.com/security-alerts/cpujul2022.html
generic_textual HIGH https://www.oracle.com/security-alerts/cpujul2022.html
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3737.json
https://api.first.org/data/v1/epss?cve=CVE-2021-3737
https://bugs.python.org/issue44022
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3737
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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
https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
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
https://www.oracle.com/security-alerts/cpujul2022.html
1995162 https://bugzilla.redhat.com/show_bug.cgi?id=1995162
cpe:2.3:a:netapp:hci:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:hci:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:management_services_for_element_software:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:management_services_for_element_software:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:netapp_xcp_smb:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:netapp_xcp_smb:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:xcp_nfs:-:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:netapp:xcp_nfs:-:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:*:*:*:*:*:*:*
cpe:2.3:a:python:python:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:codeready_linux_builder_for_ibm_z_systems:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:codeready_linux_builder_for_power_little_endian:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:*
CVE-2021-3737 https://nvd.nist.gov/vuln/detail/CVE-2021-3737
RHSA-2021:4160 https://access.redhat.com/errata/RHSA-2021:4160
RHSA-2022:1663 https://access.redhat.com/errata/RHSA-2022:1663
RHSA-2022:1764 https://access.redhat.com/errata/RHSA-2022:1764
RHSA-2022:1821 https://access.redhat.com/errata/RHSA-2022:1821
RHSA-2022:1986 https://access.redhat.com/errata/RHSA-2022:1986
USN-5083-1 https://usn.ubuntu.com/5083-1/
USN-5199-1 https://usn.ubuntu.com/5199-1/
USN-5200-1 https://usn.ubuntu.com/5200-1/
USN-5201-1 https://usn.ubuntu.com/5201-1/
USN-6891-1 https://usn.ubuntu.com/6891-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3737.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3737
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3737
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-3737
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://www.oracle.com/security-alerts/cpujul2022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.25435
EPSS Score 0.00104
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.