PatchTheCVECVE-2021-27421: NXP MCUXpresso SDK versions prior to 2.8.2 are vulnerable to integer overflow in SDK_Malloc function, which co
CVE-2021-27421 is a high-severity flaw (CVSS 7.3) affecting mcuxpresso software development kit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
NXP MCUXpresso SDK versions prior to 2.8.2 are vulnerable to integer overflow in SDK_Malloc function, which could allow to access memory locations outside the bounds of a specified array, leading to unexpected behavior such segmentation fault when assigning a particular block of memory from the heap via malloc.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.3 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.9% (top 41%) |
| CISA exploited list | No |
| Weakness | CWE-190 |
| Published | 2022-05-03 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-27421?
mcuxpresso software development kit: upgrade to 2.8.2. Exact commands for each OS are on this page.
Is CVE-2021-27421 being exploited?
CVE-2021-27421 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-27421 affect?
CVE-2021-27421 affects mcuxpresso software development kit. Severity is high (CVSS 7.3). NXP MCUXpresso SDK versions prior to 2.8.2 are vulnerable to integer overflow in SDK_Malloc function, which could allow to access memory locations outside the bounds of a specified array, leading to unexpected behavior such segmentation fau
How urgent is CVE-2021-27421?
Priority 45/100. High severity; Remotely exploitable, no login, no user action
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