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VULNERABILITIES

CVE-2020-6817 Details

Description

bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={'a': ['style']}).

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA: CISA-ADPCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=1623633 CVEExploitIssue Tracking
https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm CVEVendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1623633 [email protected]ExploitIssue Tracking
https://github.com/mozilla/bleach/security/advisories/GHSA-vqhp-cxgc-6wmm [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-1333Inefficient Regular Expression Complexity[email protected]
CWE-1333Inefficient Regular Expression ComplexityCISA-ADP

Affected Products

ProductVersions
mozilla bleach
< 3.1.4

CPE

  • cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

6 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2020-6817
NVD Published Date:
Feb 16, 2023
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2020-6817 Details - Not Deferred