Mozilla Bleach up to 3.1.3 bleach.clean resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability was found in Mozilla Bleach up to 3.1.3. It has been classified as problematic. Affected is the function bleach.clean. This manipulation causes resource consumption. The identification of this vulnerability is CVE-2020-6817. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Mozilla Bleach up to 3.1.3 (Web Browser). It has been declared as problematic. Affected by this vulnerability is the function bleach.clean. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. The summary by CVE is:

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']}).

The weakness was shared 12/11/2022. The advisory is shared at github.com. This vulnerability is known as CVE-2020-6817 since 01/10/2020. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 301534 (Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Bleach vulnerabilities (USN-8077-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.1.4 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (301534). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 301534
Nessus Name: Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Bleach vulnerabilities (USN-8077-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Bleach 3.1.4

Timelineinfo

01/10/2020 🔍
12/11/2022 +1066 days 🔍
12/11/2022 +0 days 🔍
03/10/2026 +1185 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: github.com
Status: Confirmed

CVE: CVE-2020-6817 (🔍)
GCVE (CVE): GCVE-0-2020-6817
GCVE (VulDB): GCVE-100-215269

Entryinfo

Created: 12/11/2022 08:35
Updated: 03/10/2026 11:55
Changes: 12/11/2022 08:35 (41), 03/19/2025 18:43 (28), 03/10/2026 11:55 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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