High severity · published Mar 4, 2022
CVE-2021-3737
A flaw was found in python
7.5
CVSS
13.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)13.2% · higher than 96% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PY
python ·
Fixed in python v3.6.14, python v3.7.11, python v3.8.11, python v3.9.6, python v3.10.0b2 · source: vendor, NVD
CL
Codeready Linux Builder · Redhat
8.0 · source: NVD
CL
Codeready Linux Builder For Ibm Z Systems · Redhat
8.0 · source: NVD
CL
Codeready Linux Builder For Power Little Endian · Redhat
8.0 · source: NVD
CC
Communications Cloud Native Core Binding Support Function · Oracle
22.1.3 · source: NVD
CC
Communications Cloud Native Core Network Exposure Function · Oracle
22.1.1 · source: NVD
CC
Communications Cloud Native Core Policy · Oracle
22.2.0 · source: NVD
EL
Enterprise Linux · Redhat
6.0; 7.0; 8.0 · source: NVD
EL
Enterprise Linux For Ibm Z Systems · Redhat
8.0 · source: NVD
EL
Enterprise Linux For Power Little Endian · Redhat
8.0 · source: NVD
FE
Fedora · Fedoraproject
33; 34 · source: NVD
HC
Hci · Netapp
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3737
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3737
Exploit
https://bugs.python.org/issue44022
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=1995162
Patch
https://github.com/python/cpython/pull/25916
Patch
https://github.com/python/cpython/pull/26503
lists.debian.org
https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
lists.debian.org
https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
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