CVE-2021-45117

Exp

The OPC autogenerated ANSI C stack stubs (in the NodeSets) do not handle all error cases. This can lead to a NULL pointer dereference.

Published: 2022-03-21 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-45117 is rated High Exploit Risk (65.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.40%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2021-45117

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-45117

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 2026-06-15 0.53% 1.40% +0.87%
2 2025-11-21 0.41% 0.53% +0.11%
3 2025-11-18 — 0.41% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45117

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
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.
 2.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/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:M)
Exploitation needs some favorable conditions, but not exceptional ones.
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.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2021-45117

Affected software / configurations for CVE-2021-45117

Vendor Product Version Raw CPE
opcfoundation ua-nodeset < 1.05.01 cpe:2.3:a:opcfoundation:ua-nodeset:*:*:*:*:*:*:*:*
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 sitop_manager — cpe:2.3:a:siemens:sitop_manager:-:*:*:*:*:*:*:*
siemens telecontrol_server_basic 3.0 cpe:2.3:a:siemens:telecontrol_server_basic:3.0:*:*:*:*:*:*:*

References for CVE-2021-45117

cvelogic Threat Intelligence