Vulnerability in Arm Mbed OS
CVE-2020-12885
An infinite loop 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_multiple_options() parses CoAP options in a while loop. This loop's exit condition is computed using the previously allocated heap memory required for storing the result of parsing multiple options. If the input heap memory calculation results in zero bytes, the loop exit condition is never met and the loop is not terminated. As a result, the packet parsing function never exits, leading to resource consumption.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.012 (67.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Arm Mbed OS — versions 5.15.3
Weakness classification (CWE)
References
- github.com/ARMmbed/mbed-os/issues/12929 (Third Party Advisory)
- github.com/ARMmbed/mbed-coap/pull/116 (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-12885?
- CVE-2020-12885 is a high-severity vulnerability in Arm Mbed OS, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2020-06-18.
- How severe is CVE-2020-12885?
- High severity. CVSS v3 base score is 7.5 out of 10.