CVE-2020-8492

python: wrong backtracking in urllib.request.AbstractBasicAuthHandler allows for a ReDoS

Published Jan 30, 2020 CVSS 3.1 · 6.5 Medium EPSS 6.6% KEV · Not listed
Description
Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.

Analysis

No analysis available yet

Remediation

No remediation available yet

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Debian DLA Debian DLA DLA-2280-1 python3.5 security update
Debian DLA Debian DLA DLA-3432-1 python2.7 security update
EUVD EUVD EUVD-2020-29358 Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.
Ubuntu USN Ubuntu USN USN-4333-1 Python vulnerabilities
Ubuntu USN Ubuntu USN USN-4333-2 Python vulnerabilities
Ubuntu USN Ubuntu USN USN-4754-3 Python vulnerabilities
Ubuntu USN Ubuntu USN USN-5200-1 Python vulnerabilities
Ubuntu USN Ubuntu USN USN-6891-1 Python vulnerabilities
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics epss

{'score': 0.04231}

epss

{'score': 0.03912}

Weaknesses
  • CWE-400

    Uncontrolled Resource Consumption

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Oct 14, 2026, 8:40 AM
Reserved
Jan 30, 2020, 12:00 AM
Status
Modified
Published
Jan 30, 2020, 7:15 PM
Modified
Oct 14, 2026, 9:17 AM
Severity
Moderate
Public date
Mar 2, 2020, 12:00 AM