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CVE-2021-3737

Published: Mar 4, 2022Updated: Dec 17, 2025 Sources: CVE List NVD BDU csafCWE-835
7.5HIGH
NVD MITRE
EPSS Score
11.6%
Top 4.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-835CWE-400

Affected Products

redhat
commercial·USaka red hat
codeready linux builderOn-prem
Operating Systems / linux-distro
codeready linux builder for ibm z systemsOn-prem
Operating Systems / linux-distro
codeready linux builder for power little endianOn-prem
Operating Systems / linux-distro
enterprise linuxOn-premOS
Operating Systems / linux-distro
enterprise linux for ibm z systemsOn-prem
Operating Systems / linux-distro
enterprise linux for power little endianOn-prem
Operating Systems / linux-distro
netapp
commercial·US
hci
Hardware Firmware
management services for element software
Hardware Firmware
netapp xcp smb
Hardware Firmware
ontap select deploy administration utility
Hardware Firmware
xcp nfs
Hardware Firmware
oracle
commercial·USaka oracle corp.
communications cloud native core binding support function
Communications
communications cloud native core network exposure functionOn-premWeb App
Communications / messaging-chat
communications cloud native core policyOn-premDatabase
Databases / cache-message-queue
python
oss-project·US
pythonLibraryLibrary
OSS Libraries
fedoraproject
oss-project·USaka fedora project
fedoraOn-premOS
Operating Systems / linux-distro
canonical
commercial·GBaka canonical ltd.
ubuntu linuxOn-premOS
Operating Systems / linux-distro
and 5 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2021-3737?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://bugs.python.org/issue44022
bugs.python.org
https://bugzilla.redhat.com/show_bug.cgi?id=1995162
bugzilla.redhat.com
https://github.com/python/cpython/pull/25916
github.com
and 32 more references View all →
News mentions
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