Cesanta MJS 2.20.0 has a getprop_builtin_foreign out-of-bounds read if a Built-in API name occurs in a substring of an input string.

Buffer Overflow vulnerability in Cesanta MJS version 2.22.0, allows attackers to execute arbitrary code, cause a denial of service (Dos), and obtain sensitive information via segmentation fault can occur in getprop_builtin_foreign when input string includes a name of Built-in APIs.