CVE-2021-45117
MediumPublic PoC
Published: 21 March 2022
Published
21 March 2022
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS Score
0.0052
67.3th percentile
Risk Priority
13
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-45117 is a medium-severity NULL Pointer Dereference (CWE-476) vulnerability in Siemens Simatic Net Pc. Its CVSS base score is 6.5 (Medium).
Operationally, ranked in the top 32.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-31899
Vulnerability details
The OPC autogenerated ANSI C stack stubs (in the NodeSets) do not handle all error cases. This can lead to a NULL pointer dereference.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
opcfoundation
ua-nodeset
≤ 1.05.01
siemens
simatic net pc
14, 15, 16, 17
siemens
sitop manager
all versions
siemens
telecontrol server basic
3.0
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.