CVE-2020-6817

2023-02-1622:15:10

CWE-1333

[email protected]

web.nvd.nist.gov

cve

2020

6817

redos

bleach.clean

parsing

style

attributes

denial of service

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

6.3 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

29.7%

JSON

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’]}).

Affected configurations

Vulners

NVD

Node

mozillableachRange≤3.1.4

VendorProductVersionCPE
mozillableach*cpe:2.3:a:mozilla:bleach:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
mozilla	bleach	*	cpe:2.3:a:mozilla:bleach::::::::

CNA Affected

[
  {
    "vendor": "Mozilla",
    "product": "Mozilla Bleach",
    "versions": [
      {
        "version": "unspecified",
        "lessThan": "3.1.4",
        "status": "affected",
        "versionType": "custom"
      }
    ]
  }
]