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Vulnerability details: VCID-ua1b-81hn-ykfw
Vulnerability ID VCID-ua1b-81hn-ykfw
Aliases CVE-2020-8492
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 5.9
Risk 3.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-400 Uncontrolled Resource Consumption
System Score Found at
cvssv3 6.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-8492.json
epss 0.02954 https://api.first.org/data/v1/epss?cve=CVE-2020-8492
epss 0.02954 https://api.first.org/data/v1/epss?cve=CVE-2020-8492
epss 0.02954 https://api.first.org/data/v1/epss?cve=CVE-2020-8492
epss 0.02954 https://api.first.org/data/v1/epss?cve=CVE-2020-8492
epss 0.02954 https://api.first.org/data/v1/epss?cve=CVE-2020-8492
cvssv3.1 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-8492.json
https://api.first.org/data/v1/epss?cve=CVE-2020-8492
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8492
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1809065 https://bugzilla.redhat.com/show_bug.cgi?id=1809065
970099 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=970099
GLSA-202005-09 https://security.gentoo.org/glsa/202005-09
RHSA-2020:3888 https://access.redhat.com/errata/RHSA-2020:3888
RHSA-2020:4285 https://access.redhat.com/errata/RHSA-2020:4285
RHSA-2020:4433 https://access.redhat.com/errata/RHSA-2020:4433
RHSA-2020:4641 https://access.redhat.com/errata/RHSA-2020:4641
USN-4333-1 https://usn.ubuntu.com/4333-1/
USN-4333-2 https://usn.ubuntu.com/4333-2/
USN-4754-3 https://usn.ubuntu.com/4754-3/
USN-5200-1 https://usn.ubuntu.com/5200-1/
USN-6891-1 https://usn.ubuntu.com/6891-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-8492.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.86728
EPSS Score 0.02954
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T17:08:36.432573+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.6.0