What is CVE-2021-30636?

CVE-2021-30636 is a critical-severity vulnerability in Mediatek Linkit Software Development Kit, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2022-01-24.

How severe is CVE-2021-30636?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Integer overflow in Mediatek Linkit Software Development Kit

CVE-2021-30636

In MediaTek LinkIt SDK before 4.6.1, there is a possible memory corruption due to an integer overflow during mishandled memory allocation by pvPortCalloc and pvPortRealloc.

Vulnerability class: Integer Overflow

Published 2022-01-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (72.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Mediatek Linkit Software Development Kit

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

www.cisa.gov/uscert/ics/advisories/icsa-21-119-04 (US Government Resource, VDB Entry, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2021-30636?: CVE-2021-30636 is a critical-severity vulnerability in Mediatek Linkit Software Development Kit, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2022-01-24.
How severe is CVE-2021-30636?: Critical severity. CVSS v3 base score is 9.8 out of 10.