Out-of-bounds Read in Arm Mbed Os
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.
Vulnerability class: Buffer Overflow
EPSS: 0.014 (68.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
Affected products
- Arm Mbed_os — versions 5.15.3
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-12886?
- CVE-2020-12886 is a critical-severity vulnerability in Arm Mbed Os, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2020-06-18.
- How severe is CVE-2020-12886?
- Critical severity. CVSS v3 base score is 9.1 out of 10.