MEDIUM
CVE-2021-45117
CWE-476Published: March 21, 2022· Updated: Jun 17, 2026
6.5
CVSS v3.1
Official Description
The OPC autogenerated ANSI C stack stubs (in the NodeSets) do not handle all error cases. This can lead to a NULL pointer dereference.
Technical Analysis
CVE-2021-45117 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Affected Vendors & Products
opcfoundation1 product(s)
ua-nodeset
siemens3 product(s)
simatic net pcsitop managertelecontrol server basic
Source: NVD CPE · 7 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
All References (6)
→
https://cert-portal.siemens.com/productcert/pdf/ssa-285795.pdfPatch · Third Party Advisory
→
→
https://www.youtube.com/watch?v=qv-RBdCaV4kExploit · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-285795.pdfPatch · Third Party Advisory
→
→
https://www.youtube.com/watch?v=qv-RBdCaV4kExploit · Third Party Advisory
Quick Facts
CVE IDCVE-2021-45117
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-476
CISA KEVNo
Affected2 vendor(s)
PublishedMar 21, 2022
Related CVEs (CWE-476)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-45117 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.COM. CVE data is provided under the NVD usage policy.