CVE-2021-30657
Apple macOS Unspecified Vulnerability
Apple macOS
A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina. A malicious application may bypass Gatekeeper checks. Apple is aware of a report that this issue may have been actively exploited..
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 3 November 2021. US federal agencies were required to remediate it by 17 November 2021.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 68.5%, which is higher than 99.3% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Frequently asked questions
Is CVE-2021-30657 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2021-30657.
What does CVE-2021-30657 affect?
CVE-2021-30657 affects Apple macOS. A logic issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina. A malicious application may bypass Gatekeeper checks. Apple is aware of a report that this issue may have been actively exploited..
How severe is CVE-2021-30657?
CVE-2021-30657 is rated MEDIUM with a CVSS base score of 5.5. EPSS puts the probability of exploitation in the next 30 days at 68.5%, higher than 99.3% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 17 November 2021.
How should organisations respond to CVE-2021-30657?
Apply the vendor patch for Apple macOS as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.