CVE-2021-40142

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.

Published: 2021-08-27 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-40142 is rated Moderate Risk (59.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.56%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-40142

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-20 2.38% 2.56% +0.18%
2 2026-06-15 0.50% 2.38% +1.88%
3 2026-03-15 — 0.50% —

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-40142

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-40142

Affected software / configurations for CVE-2021-40142

Vendor Product Version Raw CPE
opcfoundation local_discover_server < 1.04.402.463 cpe:2.3:a:opcfoundation:local_discover_server:*:*:*:*:*:*:*:*
siemens simatic_process_historian_opc_ua_server_firmware < 2022 cpe:2.3:o:siemens:simatic_process_historian_opc_ua_server_firmware:*:*:*:*:*:*:*:*
siemens simatic_process_historian_opc_ua_server_firmware 2022 cpe:2.3:o:siemens:simatic_process_historian_opc_ua_server_firmware:2022:-:*:*:*:*:*:*
siemens simatic_net_pc 14 cpe:2.3:a:siemens:simatic_net_pc:14:-:*:*:*:*:*:*
siemens simatic_net_pc 15 cpe:2.3:a:siemens:simatic_net_pc:15:-:*:*:*:*:*:*
siemens simatic_net_pc 16 cpe:2.3:a:siemens:simatic_net_pc:16:-:*:*:*:*:*:*
siemens simatic_net_pc 17 cpe:2.3:a:siemens:simatic_net_pc:17:-:*:*:*:*:*:*
siemens simatic_wincc — cpe:2.3:a:siemens:simatic_wincc:-:*:*:*:*:*:*:*
siemens simatic_wincc_runtime — cpe:2.3:a:siemens:simatic_wincc_runtime:-:*:*:*:professional:*:*:*
siemens simatic_wincc_unified_scada_runtime — cpe:2.3:a:siemens:simatic_wincc_unified_scada_runtime:-:*:*:*:*:*:*:*
siemens telecontrol_server_basic 3.0 cpe:2.3:a:siemens:telecontrol_server_basic:3.0:*:*:*:*:*:*:*

References for CVE-2021-40142

cvelogic Threat Intelligence