CVE-2021-33503
python-urllib3: ReDoS in the parsing of authority part of URL
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.
Se ha detectado un problema en urllib3 versiones anteriores a 1.26.5. Cuando se proporciona una URL que contiene muchos caracteres @ en el componente authority, la expresión regular de autoridad muestra un retroceso catastrófico, causando una denegación de servicio si fue pasado una URL como parámetro o es redirigido a ella por medio de un redireccionamiento HTTP
A flaw was found in python-urllib3. When provided with a URL containing many @ characters in the authority component, the authority's regular expression exhibits catastrophic backtracking. This flaw causes a denial of service if a URL is passed as a parameter or redirected via an HTTP redirect. The highest threat from this vulnerability is to system availability.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2021-05-21 CVE Reserved
- 2021-06-29 CVE Published
- 2024-03-14 EPSS Updated
- 2024-08-03 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-400: Uncontrolled Resource Consumption
- CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
CAPEC
References (8)
| URL | Tag | Source |
|---|---|---|
| https://github.com/advisories/GHSA-q2q7-5pp4-w6pg | Third Party Advisory |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://github.com/urllib3/urllib3/commit/2d4a3fee6de2fa45eb82169361918f759269b4ec | 2023-11-07 | |
| https://www.oracle.com/security-alerts/cpuoct2021.html | 2023-11-07 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Python Search vendor "Python" | Urllib3 Search vendor "Python" for product "Urllib3" | >= 1.25.4 < 1.26.5 Search vendor "Python" for product "Urllib3" and version " >= 1.25.4 < 1.26.5" | - |
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
| ||||||
| Oracle Search vendor "Oracle" | Enterprise Manager Ops Center Search vendor "Oracle" for product "Enterprise Manager Ops Center" | 12.4.0.0 Search vendor "Oracle" for product "Enterprise Manager Ops Center" and version "12.4.0.0" | - |
Affected
| ||||||
| Oracle Search vendor "Oracle" | Instantis Enterprisetrack Search vendor "Oracle" for product "Instantis Enterprisetrack" | 17.1 Search vendor "Oracle" for product "Instantis Enterprisetrack" and version "17.1" | - |
Affected
| ||||||
| Oracle Search vendor "Oracle" | Instantis Enterprisetrack Search vendor "Oracle" for product "Instantis Enterprisetrack" | 17.2 Search vendor "Oracle" for product "Instantis Enterprisetrack" and version "17.2" | - |
Affected
| ||||||
| Oracle Search vendor "Oracle" | Instantis Enterprisetrack Search vendor "Oracle" for product "Instantis Enterprisetrack" | 17.3 Search vendor "Oracle" for product "Instantis Enterprisetrack" and version "17.3" | - |
Affected
| ||||||
| Oracle Search vendor "Oracle" | Zfs Storage Appliance Kit Search vendor "Oracle" for product "Zfs Storage Appliance Kit" | 8.8 Search vendor "Oracle" for product "Zfs Storage Appliance Kit" and version "8.8" | - |
Affected
| ||||||