Vulnerability Intelligence Report
CVE-2021-33503
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.
No Active Exploit Signals
CVSS Base Score
7.5
HIGH
EPSS Probability:3.27%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
—
Weaponization
—
SSVC Action
—
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| python | urllib3 | all |
| fedoraproject | fedora | 33, 34 |
| oracle | enterprise_manager_ops_center | 12.4.0.0 |
| oracle | instantis_enterprisetrack | 17.1, 17.2, 17.3 |
| oracle | zfs_storage_appliance_kit | 8.8 |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
3.273%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | MITRE Corporation · N/A · USA |
| Reserved | 2021-05-21T00:00:00 |
| Published | 2021-06-29T10:55:35 |
| Last Updated | 2024-08-03T23:50:42 |
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