CVE-2021-27698

Name: CVE-2021-27698
Creator: NVD / NIST
Published: 2021-04-06T13:15:14.387+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.24%

Last modified Jun 17, 2026

CVE-2021-27698 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. RIOT-OS 2021.01 contains a buffer overflow vulnerability in /sys/net/gnrc/routing/rpl/gnrc_rpl_control_messages.c through the _parse_options() function.. EPSS estimates a 1.24% chance of exploitation in the next 30 days.

Description

RIOT-OS 2021.01 contains a buffer overflow vulnerability in /sys/net/gnrc/routing/rpl/gnrc_rpl_control_messages.c through the _parse_options() function.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.24%

65.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Riot-Os	Riot	2021.01

References

https://github.com/RIOT-OS/RIOT/issues/16085Third Party Advisory
https://github.com/RIOT-OS/RIOT/issues/16085Third Party Advisory

Timeline

Published: Apr 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27698?

RIOT-OS 2021.01 contains a buffer overflow vulnerability in /sys/net/gnrc/routing/rpl/gnrc_rpl_control_messages.c through the _parse_options() function.

How severe is CVE-2021-27698?

CVE-2021-27698 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.24% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27698?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27698?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST