VulnerabilityModified
CVE-2021-3737
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.
HIGH 7.5EPSS 11.6%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 11.6%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 11.59% probability · 96th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-835, CWE-400
- Affected
- python/python · redhat/codeready linux builder · redhat/codeready linux builder for ibm z systems · redhat/codeready linux builder for power little endian · redhat/enterprise linux · redhat/enterprise linux for ibm z systems · redhat/enterprise linux for power little endian · fedoraproject/fedora · canonical/ubuntu linux · netapp/hci · netapp/management services for element software · netapp/netapp xcp smb · netapp/ontap select deploy administration utility · netapp/xcp nfs · oracle/communications cloud native core binding support function · oracle/communications cloud native core network exposure function · oracle/communications cloud native core policy
- Source
- secalert@redhat.com
References
- https://bugs.python.org/issue44022Exploit, Issue Tracking, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1995162Issue Tracking, Patch, Third Party Advisory
- https://github.com/python/cpython/pull/25916Patch, Third Party Advisory
- https://github.com/python/cpython/pull/26503Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.htmlPatch, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220407-0009/Third Party Advisory
- https://ubuntu.com/security/CVE-2021-3737Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://bugs.python.org/issue44022Exploit, Issue Tracking, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1995162Issue Tracking, Patch, Third Party Advisory
- https://github.com/python/cpython/pull/25916Patch, Third Party Advisory
- https://github.com/python/cpython/pull/26503Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html
- https://lists.debian.org/debian-lts-announce/2024/11/msg00024.html
- https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html
- https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.htmlPatch, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220407-0009/Third Party Advisory
- https://ubuntu.com/security/CVE-2021-3737Patch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.