What’s Vulnerable › Vulnerabilities

CVE-2020-12886

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-18 · updated 2026-06-17
• Weakness: CWE-125

Description

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.

Affected products

• Arm Mbed Os: 5.15.3

References

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

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