CVE-2021-3625

Name: CVE-2021-3625
Creator: NVD / NIST
Published: 2021-10-05T21:15:09.463+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.27%

Last modified Jun 17, 2026

CVE-2021-3625 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Buffer overflow in Zephyr USB DFU DNLOAD. Zephyr versions >= v2.5.0 contain Heap-based Buffer Overflow (CWE-122). EPSS estimates a 2.27% chance of exploitation in the next 30 days.

Description

Buffer overflow in Zephyr USB DFU DNLOAD. Zephyr versions >= v2.5.0 contain Heap-based Buffer Overflow (CWE-122). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c3gr-hgvr-f363

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

2.27%

80.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zephyrproject	Zephyr	>= 2.5.0, < 2.7.0

References

http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c3gr-hgvr-f363Exploit, Third Party Advisory
http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-c3gr-hgvr-f363Exploit, Third Party Advisory

Timeline

Published: Oct 5, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3625?

How severe is CVE-2021-3625?

CVE-2021-3625 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.27% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3625?

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-2021-3625?

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

Scan your code now

Source: NVD / NIST