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.

• CWE-125

• https://github.com/ARMmbed/mbed-coap/pull/116Third Party Advisory
• https://github.com/ARMmbed/mbed-os/issues/12948Third Party Advisory
• https://github.com/ARMmbed/mbed-coap/pull/116Third Party Advisory
• https://github.com/ARMmbed/mbed-os/issues/12948Third Party Advisory

Published

Jun 18, 2020

Last Modified

Jun 17, 2026

Status

Modified

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