CVE-2020-23309: 
NixOS vulnerability analysis and mitigation

A vulnerability was discovered in JerryScript version 2.2.0 related to an assertion failure in the parser_parse_statements function. The vulnerability is tracked as CVE-2020-23309 and was identified in the js-parser-statm.c file at line 2756 (GitHub Issue).

The vulnerability manifests as an assertion failure with the condition 'context_p->stack_depth == context_p->context_stack_depth' in the parser_parse_statements function. According to the National Vulnerability Database, this issue has been assigned a CVSS v3.1 Base Score of 7.5 (HIGH) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (NVD).

The vulnerability affects the availability of the system, with no direct impact on confidentiality or integrity. When triggered, it results in a program crash due to the assertion failure, potentially causing a denial of service condition (NVD).

The vulnerability can be triggered by processing specific JavaScript code that causes a mismatch between stack depth values. A proof of concept exists that involves attempting to assign to the result of a parseFloat operation: 'try { (isNaN(parseFloat("."))) = 'abcd'; } catch (e) { }' (GitHub Issue).