CVE-2021-33503

Aliases:GHSA-q2q7-5pp4-w6pgPYSEC-2021-108
Advisory lineage Upstream: 0 Downstream: 16
Modified
Published: 29 Jun 2021, 10:55
Last modified:03 Aug 2024, 23:50

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.1 (nvd)
EPSS Score
0.86% LOW
1% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

29 Jun 2021, 10:55
Published
Vulnerability first disclosed
03 Aug 2024, 23:50
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v4.0•HIGH•Score: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v2.0•MEDIUM•Score: 5AV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.86%• Percentile: 75%

Techniques & Countermeasures

  • CWE-400•Uncontrolled Resource Consumption

    The product does not properly control the allocation and maintenance of a limited resource.

Affected Systems

  • 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

  • PyPI•urllib3

    < 2d4a3fee6de2fa45eb82169361918f759269b4ec | < 1.26.5 | ≥ 1.25.4, < 1.26.5

  • python•urllib3

    ≥ 1.25.4, < 1.26.5

References (13)