What is CVE-2021-31663?

CVE-2021-31663 is a high-severity vulnerability in Riot-Os Riot, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-06-18.

How severe is CVE-2021-31663?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Riot-Os Riot

CVE-2021-31663

RIOT-OS 2021.01 before commit bc59d60be60dfc0a05def57d74985371e4f22d79 contains a buffer overflow which could allow attackers to obtain sensitive information.

Vulnerability class: Buffer Overflow

Published 2021-06-18 · last modified 2026-06-17.

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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.016 (75.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Riot-Os Riot — versions 2021.01

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

github.com/RIOT-OS/RIOT/issues/15927 (Third Party Advisory)
github.com/RIOT-OS/RIOT/pull/15929 (Third Party Advisory)
github.com/RIOT-OS/RIOT/commit/bc59d60be60dfc0a05def57d74985371e4f22d79 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-31663?: CVE-2021-31663 is a high-severity vulnerability in Riot-Os Riot, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-06-18.
How severe is CVE-2021-31663?: High severity. CVSS v3 base score is 7.5 out of 10.