Denial of service in Mozilla Bleach

Published: 2020-03-26 | Updated: 2020-04-07
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-6817
Exploitation vector Network
Public exploit N/A
Vulnerable software
Universal components / Libraries / Libraries used by multiple products

Vendor Mozilla

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated 07.04.2020

Assigned CVE-ID number.

1) Resource management error

EUVDB-ID: #VU26415

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-6817

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation when parsing style attrbitues. A remote attacker can create a specially crafted web page that can result in regular expression denial of service (ReDoS).


Install updates from vendor's website.

Vulnerable software versions

Bleach: 2.1 - 3.1.3

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.