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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.014 (70.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Arm Mbed OS — versions 5.15.3
Weakness classification (CWE)
References
- github.com/ARMmbed/mbed-os/issues/12948 (Third Party Advisory)
- github.com/ARMmbed/mbed-coap/pull/116 (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.