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Fencer Vulns
high 7.5

CVE-2021-40142 json

In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a denial of service (DoS) by sending careful…

published 2021-08-27 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27329

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

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.

Patch / fix

  • opcfoundation local_discover_server 1.04.402.463
  • siemens simatic_process_historian_opc_ua_server_firmware 2022

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-22-132-12 updated cvss 7.5

Siemens Industrial Products

  • Siemens OpenPCS 7 V9.1
    affected: mitigation, no fix planned
  • Siemens SIMATIC NET PC Software V14 <V14_SP1_Update_14
    affected: fixed in V14, mitigation support.industry.siemens.com
  • Siemens SIMATIC NET PC Software V15
    affected: mitigation, no fix planned
  • Siemens SIMATIC NET PC Software V16 <V16_Update_6
    affected: fixed in V16, mitigation
  • Siemens SIMATIC NET PC Software V17 <V17_SP1
    affected: fixed in V17, mitigation
  • Siemens SIMATIC Process Historian OPC UA Server <V2020_SP1
    affected: fixed in V2020, mitigation
  • Siemens SIMATIC WinCC <V8.0
    affected: fixed in V8.0, mitigation support.industry.siemens.com
  • Siemens SIMATIC WinCC Runtime Professional <V18
    affected: fixed in V18, mitigation support.industry.siemens.com
show 2 more

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

2.56% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.