High
Mozilla Firefox could allow a remote attacker to execute arbitrary code on the system, caused by a use-after-free write when handling a malicious COOKIE-ECHO SCTP chunk. By persuading a victim to visit a specially-crafted Web site, a remote attacker could exploit this vulnerability using to execute arbitrary code on the vulnerable system or cause a denial of service.
Mozilla
Refer to Mozilla Foundation Security Advisory 2021-01 for patch, upgrade or suggested workaround information.