HOMEVULNERABILITIESCVE-2021-30636
CRITICAL

CVE-2021-30636

CWE-190Published: January 24, 2022· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-30636 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

mediatek1 product(s)
linkit software development kit
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04
ADVISORYhttps://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04

All References (2)

→
https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04Mitigation · Third Party Advisory · US Government Resource · VDB Entry
→
https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04Mitigation · Third Party Advisory · US Government Resource · VDB Entry

Quick Facts

CVE IDCVE-2021-30636
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-190
CISA KEVNo
Affected1 vendor(s)
PublishedJan 24, 2022

Related CVEs (CWE-190)

CVE-2015-5108
10.0
CVE-2015-5097
10.0
CVE-2012-5835
10.0
CVE-2013-2555
10.0
CVE-2012-5143
10.0
CVE-2008-2663
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-30636 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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