HIGH CISA KEV

CVE-2020-6820

CVSS v3

8.1

HIGH

EPSS Score

5.0%

exploit probability

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

Description

Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.

CISA Known Exploited Vulnerability

Date Added
11/3/2021
Patch Due Date
5/3/2022
Ransomware Use
Unknown

Technical details

Published
4/24/2020

Frequently asked questions

What is CVE-2020-6820?

Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.

Is CVE-2020-6820 actively exploited?

Yes. CVE-2020-6820 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 5/3/2022.

What is the CVSS score for CVE-2020-6820?

CVE-2020-6820 has a CVSS v3 base score of 8.1 (HIGH severity).

Is CVE-2020-6820 affecting your environment?

Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.

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