Medium severity · published Mar 21, 2022
CVE-2021-45117
The OPC autogenerated ANSI C stack stubs (in the NodeSets) do not handle all error cases
6.5
CVSS
1.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 73% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SN
Simatic Net PC · Siemens
14; 15; 16; 17 · source: NVD
SM
Sitop Manager · Siemens
All versions, or not specified · source: NVD
TS
Telecontrol Server Basic · Siemens
3.0 · source: NVD
UA
Ua-nodeset · Opcfoundation
before 1.05.01 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-45117
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-45117
Patch
https://cert-portal.siemens.com/productcert/pdf/ssa-285795.pdf
Patch
https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2021-45117.pdf
Exploit
https://www.youtube.com/watch?v=qv-RBdCaV4k