Vulnerability Details CVE-2020-12886
A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3. The CoAP parser is responsible for parsing received CoAP packets. The function sn_coap_parser_options_parse() parses the CoAP packet header starting from the message token. The length of the token in the received message is provided in the first byte parsed by the sn_coap_parser_options_parse() function. The length encoded in the message is not validated against the actual input buffer length before accessing the token. As a result, memory access outside of the intended boundary of the buffer may occur.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 67.2%
CVSS Severity
CVSS v3 Score 9.1
CVSS v2 Score 6.4
References