CVE-2021-26461

Name: CVE-2021-26461
Creator: NVD / NIST
Published: 2021-06-21T17:15:09.103+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 5.04%

Last modified Jun 17, 2026

CVE-2021-26461 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Apache Nuttx Versions prior to 10.1.0 are vulnerable to integer wrap-around in functions malloc, realloc and memalign. This improper memory assignment can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.. EPSS estimates a 5.04% chance of exploitation in the next 30 days.

Description

Apache Nuttx Versions prior to 10.1.0 are vulnerable to integer wrap-around in functions malloc, realloc and memalign. This improper memory assignment can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

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

5.04%

91.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apache	Nuttx	< 10.1.0

References

https://lists.apache.org/thread.html/r806fccf8b003ae812d807c6c7d97950d44ed29b2713418cbe3f2bddd%40%3Cdev.nuttx.apache.org%3EMailing List, Vendor Advisory
https://lists.apache.org/thread.html/r806fccf8b003ae812d807c6c7d97950d44ed29b2713418cbe3f2bddd%40%3Cdev.nuttx.apache.org%3EMailing List, Vendor Advisory

Timeline

Published: Jun 21, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26461?

How severe is CVE-2021-26461?

CVE-2021-26461 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 5.04% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26461?

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-2021-26461?

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

Scan your code now

Source: NVD / NIST