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Collection Degraded30 / 46 Sources HealthyPublic Intel Only
Vulnerabilities/CVE-2021-3737Public Intelligence Dossier
Source: python · Limited verification•Last verified: •Collection Degraded
CVE-2021-3737Unknown / EvaluatingHIGH (raw)CVSS 7.5CWE-835

A flaw was found in python

Published: 05 Mar 2022•Last updated: 14 Oct 2026, 03:47 PM IST•Source identifier: secalert@redhat.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
7.5HIGH (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Metric sourcenvd@nist.gov
EPSS probability
13.2%0.132
Percentile96th
Weakness type
CWE-835
CWE-400
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

High

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; HIGH severity; No confirmed exploitation signal in current enrichment

Affected Products & Remediation

17 source-backed products
Affected products and versions (source)
  • python python · >= 3.6.0 < 3.6.14; >= 3.7.0 < 3.7.11; >= 3.8.0 < 3.8.11; >= 3.9.0 < 3.9.6 · NVD CPE · Source
  • redhat codeready linux builder · 8.0; for ibm z systems 8.0; for power little endian 8.0 · NVD CPE · Source
  • redhat codeready linux builder for ibm z systems · 8.0 · NVD CPE · Source
  • redhat codeready linux builder for power little endian · 8.0 · NVD CPE · Source
  • redhat enterprise linux · 6.0; 7.0; 8.0; for ibm z systems 8.0; for power little endian 8.0 · NVD CPE · Source
  • redhat enterprise linux for ibm z systems · 8.0 · NVD CPE · Source
  • redhat enterprise linux for power little endian · 8.0 · NVD CPE · Source
  • fedoraproject fedora · 33; 34 · NVD CPE · Source
  • canonical ubuntu linux · 14.04; 16.04; 18.04; 20.04; 21.04 · NVD CPE · Source
  • netapp hci · version range not provided by source · NVD CPE · Source
  • netapp management services for element software · version range not provided by source · NVD CPE · Source
  • netapp netapp xcp smb · version range not provided by source · NVD CPE · Source
  • netapp ontap select deploy administration utility · version range not provided by source · NVD CPE · Source
  • netapp xcp nfs · version range not provided by source · NVD CPE · Source
  • oracle communications cloud native core binding support function · 22.1.3 · NVD CPE · Source
  • oracle communications cloud native core network exposure function · 22.1.1 · NVD CPE · Source
  • oracle communications cloud native core policy · 22.2.0 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Confirm the source-stated update is installed and the CVE is no longer reported.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule network-unauthenticated

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
secalert@redhat.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*, cpe:2.3:a:redhat:codeready_linux_builder:8.0:*:*:*:*:*:*:*, 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:*:*:*:*:*:*:*, cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*, cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*, cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*, 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:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

Evidence & Provenance

3 public sources
bugs.python.orgSource recordnvd.nist.govSource recordbugzilla.redhat.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2021-3737
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2021-3737
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2021-3737"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

Correlated briefings

— No published briefing references this CVE

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.