Technical Severity
HIGH
CVSS v3.1 Metrics
8.1
/ 10
Minimal Risk
Critical
Vector Specification
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Likelihood
EPSS Prediction
0.33
%
Predictive Probability
Percentile Rank
55.3
th
Documented as more likely to be exploited than 55.3% of known CVEs.
Detection Date
Nov 03, 2021
Remediation Due
May 03, 2022
CISA Catalog Active
Threat Analysis
Mozilla Firefox and Thunderbird contain a race condition vulnerability when running the nsDocShell destructor under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts.
Remediation Directive
Apply updates per vendor instructions.