HOMEVULNERABILITIESCVE-2021-27435
CRITICAL

CVE-2021-27435

CWE-190Published: May 3, 2022· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

ARM mbed product Version 6.3.0 is vulnerable to integer wrap-around in malloc_wrapper function, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

NVD Source

Technical Analysis

CVE-2021-27435 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

arm1 product(s)
mbed
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

PATCHhttps://github.com/ARMmbed/mbed-os/pull/14408
PATCHhttps://github.com/ARMmbed/mbed-os/pull/14408
ADVISORYhttps://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04
ADVISORYhttps://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04

All References (4)

→
https://github.com/ARMmbed/mbed-os/pull/14408Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04Third Party Advisory · US Government Resource
→
https://github.com/ARMmbed/mbed-os/pull/14408Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2021-27435
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-190
CISA KEVNo
Affected1 vendor(s)
PublishedMay 3, 2022

Related CVEs (CWE-190)

CVE-2008-2663
10.0
CVE-2010-3254
10.0
CVE-2015-5097
10.0
CVE-2026-24814
10.0
CVE-2015-5108
10.0
CVE-2012-5143
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-27435 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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