A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.0.1, iTunes for Windows 12.10.9. Processing a maliciously crafted text file may lead to arbitrary code execution.
https://support.apple.com/en-us/HT211931
https://support.apple.com/en-us/HT211952
http://seclists.org/fulldisclosure/2020/Dec/32
https://support.apple.com/kb/HT211843
https://support.apple.com/kb/HT211850
Source: MITRE
Published: 2020-12-08
Updated: 2021-07-21
Type: CWE-119
Base Score: 6.8
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 7.8
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH