HOMEVULNERABILITIESCVE-2021-40872
HIGH

CVE-2021-40872

CWE-843Published: November 10, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

An issue was discovered in Softing Industrial Automation uaToolkit Embedded before 1.40. Remote attackers to cause a denial of service (DoS) or login as an anonymous user (bypassing security checks) by sending crafted messages to a OPC/UA server. The server process may crash unexpectedly because of an invalid type cast, and must be restarted.

NVD Source

Technical Analysis

CVE-2021-40872 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 availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

softing2 product(s)
smartlink hw-dpuatoolkit embedded
Source: NVD CPE · 2 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://industrial.softing.com/
ADVISORYhttps://industrial.softing.com/fileadmin/sof-files/pdf/ia/support/Security_Bulletin_CVE-2021-40872.pdf
ADVISORYhttps://industrial.softing.com/
ADVISORYhttps://industrial.softing.com/fileadmin/sof-files/pdf/ia/support/Security_Bulletin_CVE-2021-40872.pdf

All References (4)

→
https://industrial.softing.com/Vendor Advisory
→
https://industrial.softing.com/fileadmin/sof-files/pdf/ia/support/Security_Bulletin_CVE-2021-40872.pdfVendor Advisory
→
https://industrial.softing.com/Vendor Advisory
→
https://industrial.softing.com/fileadmin/sof-files/pdf/ia/support/Security_Bulletin_CVE-2021-40872.pdfVendor Advisory

Quick Facts

CVE IDCVE-2021-40872
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-843
CISA KEVNo
Affected1 vendor(s)
PublishedNov 10, 2021

Related CVEs (CWE-843)

CVE-2021-33970
10.0
CVE-2010-2299
10.0
CVE-2021-23509
9.8
CVE-2016-1000005
9.8
CVE-2019-7131
9.8
CVE-2021-23908
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-40872 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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