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.
- Score
- CVSS 3.1 7.5 High
- Status
- Modified - secalert@redhat.com
- Published
- 2022-03-04
- Last modified
- 2026-10-14
- Weaknesses
- CWE-400, CWE-835
Affected products
- Ubuntu Linux (Canonical)
- Fedora (Fedoraproject)
- Hci (Netapp)
- Management Services For Element Software (Netapp)
- Netapp Xcp Smb (Netapp)
- Ontap Select Deploy Administration Utility (Netapp)
- Xcp Nfs (Netapp)
- Communications Cloud Native Core Binding Support Function (Oracle)
- Communications Cloud Native Core Network Exposure Function (Oracle)
- Communications Cloud Native Core Policy (Oracle)
- Python (Python)
- 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 (Redhat)
- Simatic S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
- Simatic S7-1500 Cpu 1518f-4 Pndp Mfp (Siemens)
- Siplus S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
References
- https://bugs.python.org/issue44022
- https://github.com/python/cpython/pull/25916
- https://bugzilla.redhat.com/show_bug.cgi?id=1995162
- https://github.com/python/cpython/pull/26503
- https://ubuntu.com/security/CVE-2021-3737
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html
- https://security.netapp.com/advisory/ntap-20220407-0009/
- 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/2024/12/msg00000.html
- https://lists.debian.org/debian-lts-announce/2024/11/msg00024.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html