CVE-2021-40142
HIGH
7.5
CVSS Score
Published: August 27, 2021 at 06:51 AM UTC
Updated: June 17, 2026 at 04:06 AM UTC
8 products affected across 2 vendorsTeleControl Server BasicSIMATIC WinCCSIMATIC Wincc Runtime
Using N/A by N/A?
Get instant alerts when new vulnerabilities affect N/A - before attackers find them.
Real-time alertsTrack your software stackFree plan available
Severity
HIGH7.5
Exploit prediction
EPSS 3%
Description
In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a denial of service (DoS) by sending carefully crafted messages that lead to Access of a Memory Location After the End of a Buffer.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 1.04.402.463
Affected range stops below 1.04.402.463, so it looks safe — our inference, not a vendor statement
v < 20222022
Affected range stops below 2022, so it looks safe — our inference, not a vendor statement
siemens-simatic-process-historian-opc-ua-server (same device)
All versions
All versions
All versions
All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (3)
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://cert-portal.siemens.com/productcert/pdf/ssa-321292.pdfx_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2021-40142.pdfx_refsource_MISCVendor Advisory
Source: [email protected]
https://opcfoundation.org/security-bulletins/CVSS
7.5HIGHmitre
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-119
Get alerted
Stop reading CVE feeds looking for your own stack
Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.
Free plan, no card