CVE-2021-3737
CVSS v3
7.5
HIGH
EPSS Score
11.6 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2022-03-04
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.
Is CVE-2021-3737 actively exploited?
Active exploitation of CVE-2021-3737 has not been confirmed. Its EPSS score was 11.6% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-3737?
CVE-2021-3737 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2021-3737 affecting your environment?
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