An integer overflow in the getnum function in lua_struct.c in Redis before 6.0.3 allows context-dependent attackers with permission to run Lua code in a Redis session to cause a denial of service (memory corruption and application crash) or possibly bypass intended sandbox restrictions via a large number, which triggers a stack-based buffer overflow. NOTE: this issue exists because of a CVE-2015-8080 regression.
https://www.oracle.com/security-alerts/cpujan2021.html
https://www.debian.org/security/2020/dsa-4731
https://security.gentoo.org/glsa/202008-17
https://github.com/antirez/redis/pull/6875
https://github.com/antirez/redis/commit/ef764dde1cca2f25d00686673d1bc89448819571
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00058.html