CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild and listed in the CISA Known Exploited Vulnerabilities catalog.

Remediation Deadline: May 3, 2022

CVE-2020-6820

High

EPSS 5.0%CISA KEV

Mozilla/Firefox and Thunderbird

Description

Mozilla Firefox and Thunderbird contain a race condition vulnerability when handling a ReadableStream under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts.

EPSS — Exploit Probability

5.0%

Higher than 89.6% of all CVEs

Required Action

https://nvd.nist.gov/vuln/detail/CVE-2020-6820

Risk Assessment

ELEVATED

In CISA KEV

Details

Severity: High
EPSS: 5.0%
CISA KEV: Yes
Ransomware: Unknown
Articles: 0

Timeline

Published

Nov 3, 2021

Added to KEV

Nov 3, 2021

Remediation Due

May 3, 2022

Affected Product

Mozilla

Firefox and Thunderbird

View all Mozilla CVEs

External Links

NVD (NIST)CVE Details MITRE CVE