CVE-2020-6817

Published Feb 16, 2023

Last updated 2 years ago

Overview

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']}).
Source: security@mozilla.org
NVD status: Analyzed

Risk scores

CVSS 3.1

Type: Primary
Base score: 7.5
Impact score: 3.6
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity: HIGH

Weaknesses

nvd@nist.gov: CWE-1333

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "21F7320C-9B5F-4B16-896E-2326A8B8B488",
            "versionEndExcluding": "3.1.4"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]

References