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CVE-2021-3737

HIGHCVSS 7.5/10EPSS 11.59%

Last modified

CVE-2021-3737 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 11.59% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
11.59%

95.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
PythonPython>= 3.6.0, < 3.6.14
PythonPython>= 3.7.0, < 3.7.11
PythonPython>= 3.8.0, < 3.8.11
PythonPython>= 3.9.0, < 3.9.6
RedhatCodeready Linux Builder8.0
RedhatCodeready Linux Builder For Ibm Z Systems8.0
RedhatCodeready Linux Builder For Power Little Endian8.0
RedhatEnterprise Linux6.0
RedhatEnterprise Linux7.0
RedhatEnterprise Linux8.0
RedhatEnterprise Linux For Ibm Z Systems8.0
RedhatEnterprise Linux For Power Little Endian8.0
FedoraprojectFedora33
FedoraprojectFedora34
CanonicalUbuntu Linux14.04
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux20.04
CanonicalUbuntu Linux21.04
NetappHciAll versions
NetappManagement Services For Element SoftwareAll versions
NetappNetapp Xcp SmbAll versions
NetappOntap Select Deploy Administration UtilityAll versions
NetappXcp NfsAll versions
OracleCommunications Cloud Native Core Binding Support Function22.1.3
OracleCommunications Cloud Native Core Network Exposure Function22.1.1
OracleCommunications Cloud Native Core Policy22.2.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-3737?
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.
How severe is CVE-2021-3737?
CVE-2021-3737 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 11.59% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3737?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3737?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST