CVE-2021-3737
python: urllib: HTTP client possible infinite loop on a 100 Continue response
Severity Score
7.5
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
1
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
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.
Se ha encontrado un fallo en python. Una respuesta HTTP manejada inapropiadamente en el código del cliente HTTP de python puede permitir a un atacante remoto, que controle el servidor HTTP, hacer que el script del cliente entre en un bucle infinito, consumiendo tiempo de CPU. La mayor amenaza de esta vulnerabilidad es la disponibilidad del sistema
Red Hat Advanced Cluster Management for Kubernetes 2.5.0 images Red Hat Advanced Cluster Management for Kubernetes provides the capabilities to address common challenges that administrators and site reliability engineers face as they work across a range of public and private cloud environments. Clusters and applications are all visible and managed from a single console—with security policy built in. This advisory contains the container images for Red Hat Advanced Cluster Management for Kubernetes, which fix several bugs and security issues. Issues addressed include privilege escalation and traversal vulnerabilities.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2021-08-26 CVE Reserved
- 2021-09-17 CVE Published
- 2024-08-03 CVE Updated
- 2024-08-03 First Exploit
- 2025-03-30 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-400: Uncontrolled Resource Consumption
- CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
CAPEC
References (11)
| URL | Tag | Source |
|---|---|---|
| https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html | Mailing List |
|
| https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html | Mailing List |
|
| https://security.netapp.com/advisory/ntap-20220407-0009 | Third Party Advisory |
|
| URL | Date | SRC |
|---|---|---|
| https://bugs.python.org/issue44022 | 2024-08-03 |
| URL | Date | SRC |
|---|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1995162 | 2022-05-10 | |
| https://github.com/python/cpython/pull/25916 | 2023-11-07 | |
| https://github.com/python/cpython/pull/26503 | 2023-11-07 | |
| https://python-security.readthedocs.io/vuln/urllib-100-continue-loop.html | 2023-11-07 | |
| https://ubuntu.com/security/CVE-2021-3737 | 2023-11-07 | |
| https://www.oracle.com/security-alerts/cpujul2022.html | 2023-11-07 |
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2021-3737 | 2022-05-10 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Python Search vendor "Python" | Python Search vendor "Python" for product "Python" | >= 3.6.0 < 3.6.14 Search vendor "Python" for product "Python" and version " >= 3.6.0 < 3.6.14" | - |
Affected
| ||||||
| Python Search vendor "Python" | Python Search vendor "Python" for product "Python" | >= 3.7.0 < 3.7.11 Search vendor "Python" for product "Python" and version " >= 3.7.0 < 3.7.11" | - |
Affected
| ||||||
| Python Search vendor "Python" | Python Search vendor "Python" for product "Python" | >= 3.8.0 < 3.8.11 Search vendor "Python" for product "Python" and version " >= 3.8.0 < 3.8.11" | - |
Affected
| ||||||
| Python Search vendor "Python" | Python Search vendor "Python" for product "Python" | >= 3.9.0 < 3.9.6 Search vendor "Python" for product "Python" and version " >= 3.9.0 < 3.9.6" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Codeready Linux Builder Search vendor "Redhat" for product "Codeready Linux Builder" | 8.0 Search vendor "Redhat" for product "Codeready Linux Builder" and version "8.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Codeready Linux Builder For Ibm Z Systems Search vendor "Redhat" for product "Codeready Linux Builder For Ibm Z Systems" | 8.0 Search vendor "Redhat" for product "Codeready Linux Builder For Ibm Z Systems" and version "8.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Codeready Linux Builder For Power Little Endian Search vendor "Redhat" for product "Codeready Linux Builder For Power Little Endian" | 8.0 Search vendor "Redhat" for product "Codeready Linux Builder For Power Little Endian" and version "8.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 6.0 Search vendor "Redhat" for product "Enterprise Linux" and version "6.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 7.0 Search vendor "Redhat" for product "Enterprise Linux" and version "7.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux For Ibm Z Systems Search vendor "Redhat" for product "Enterprise Linux For Ibm Z Systems" | 8.0 Search vendor "Redhat" for product "Enterprise Linux For Ibm Z Systems" and version "8.0" | - |
Affected
| ||||||
| Redhat Search vendor "Redhat" | Enterprise Linux For Power Little Endian Search vendor "Redhat" for product "Enterprise Linux For Power Little Endian" | 8.0 Search vendor "Redhat" for product "Enterprise Linux For Power Little Endian" and version "8.0" | - |
Affected
| ||||||
| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 33 Search vendor "Fedoraproject" for product "Fedora" and version "33" | - |
Affected
| ||||||
| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 34 Search vendor "Fedoraproject" for product "Fedora" and version "34" | - |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04" | esm |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04" | esm |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04" | lts |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 20.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "20.04" | lts |
Affected
| ||||||
| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 21.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "21.04" | - |
Affected
| ||||||
| Netapp Search vendor "Netapp" | Hci Search vendor "Netapp" for product "Hci" | - | - |
Affected
| ||||||
| Netapp Search vendor "Netapp" | Management Services For Element Software Search vendor "Netapp" for product "Management Services For Element Software" | - | - |
Affected
| ||||||
| Netapp Search vendor "Netapp" | Netapp Xcp Smb Search vendor "Netapp" for product "Netapp Xcp Smb" | - | - |
Affected
| ||||||
| Netapp Search vendor "Netapp" | Ontap Select Deploy Administration Utility Search vendor "Netapp" for product "Ontap Select Deploy Administration Utility" | - | - |
Affected
| ||||||
| Netapp Search vendor "Netapp" | Xcp Nfs Search vendor "Netapp" for product "Xcp Nfs" | - | - |
Affected
| ||||||
| Oracle Search vendor "Oracle" | Communications Cloud Native Core Binding Support Function Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function" | 22.1.3 Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function" and version "22.1.3" | - |
Affected
| ||||||
| Oracle Search vendor "Oracle" | Communications Cloud Native Core Network Exposure Function Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function" | 22.1.1 Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function" and version "22.1.1" | - |
Affected
| ||||||
| Oracle Search vendor "Oracle" | Communications Cloud Native Core Policy Search vendor "Oracle" for product "Communications Cloud Native Core Policy" | 22.2.0 Search vendor "Oracle" for product "Communications Cloud Native Core Policy" and version "22.2.0" | - |
Affected
| ||||||