CVE-2020-12886

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.

Category

9.1
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.56%
Third-Party Advisory github.com Third-Party Advisory github.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/ARMmbed/mbed-os/issues/12948 third party advisory
https://github.com/ARMmbed/mbed-coap/pull/116 third party advisory

Frequently Asked Questions

What is the severity of CVE-2020-12886?
CVE-2020-12886 has been scored as a critical severity vulnerability.
How to fix CVE-2020-12886?
To fix CVE-2020-12886, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-12886 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-12886 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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