CVE-2020-12886
A buffer over-read was discovered in the CoAP library in Arm Mbed OS 5.15.3.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 1.35% probability · 70th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- arm/mbed os
- Source
- cve@mitre.org
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.