Vulnerabilities > CVE-2021-23995 - Operation on a Resource after Expiration or Release vulnerability in Mozilla Firefox
Attack vector
NETWORK Attack complexity
HIGH Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.