How severe is CVE-2021-31892?

CVE-2021-31892 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-31892 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31892?

CVE-2021-31892 primarily affects Siemens Sinumerik Analyse Mycondition Firmware. In total, 31 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-31892?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-31892 published?

CVE-2021-31892 was published on 2021-07-13 and last updated on 2026-06-17.

CVE-2021-31892

CVE-2021-31892 is a high-severity vulnerability in Siemens Sinumerik Analyse Mycondition Firmware with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-295.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 5.8
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Siemens Sinumerik Analyse Mycondition Firmware
Published: 2021-07-13
Last modified: 2026-06-17

Description

A vulnerability has been identified in SINUMERIK Analyse MyCondition (All versions), SINUMERIK Analyze MyPerformance (All versions), SINUMERIK Analyze MyPerformance /OEE-Monitor (All versions), SINUMERIK Analyze MyPerformance /OEE-Tuning (All versions), SINUMERIK Integrate Client 02 (All versions >= V02.00.12 < 02.00.18), SINUMERIK Integrate Client 03 (All versions >= V03.00.12 < 03.00.18), SINUMERIK Integrate Client 04 (V04.00.02 and all versions >= V04.00.15 < 04.00.18), SINUMERIK Integrate for Production 4.1 (All versions < V4.1 SP10 HF3), SINUMERIK Integrate for Production 5.1 (V5.1), SINUMERIK Manage MyMachines (All versions), SINUMERIK Manage MyMachines /Remote (All versions), SINUMERIK Manage MyMachines /Spindel Monitor (All versions), SINUMERIK Manage MyPrograms (All versions), SINUMERIK Manage MyResources /Programs (All versions), SINUMERIK Manage MyResources /Tools (All versions), SINUMERIK Manage MyTools (All versions), SINUMERIK Operate V4.8 (All versions < V4.8 SP8), SINUMERIK Operate V4.93 (All versions < V4.93 HF7), SINUMERIK Operate V4.94 (All versions < V4.94 HF5), SINUMERIK Optimize MyProgramming /NX-Cam Editor (All versions). Due to an error in a third-party dependency the ssl flags used for setting up a TLS connection to a server are overwitten with wrong settings. This results in a missing validation of the server certificate and thus in a possible TLS MITM szenario.

Frequently asked questions

What is CVE-2021-31892?: A vulnerability has been identified in SINUMERIK Analyse MyCondition (All versions), SINUMERIK Analyze MyPerformance (All versions), SINUMERIK Analyze MyPerformance /OEE-Monitor (All versions), SINUMERIK Analyze MyPerformance /OEE-Tuning (All versions), SINUMERIK Integrate Client 02 (All versions >= V02.00.12 < 02.00.18), SINUMERIK Integrate Client 03 (All versions >= V03.00.12 < 03.00.18), SINUMERIK Integrate Client 04 (V04.00.02 and all versions >= V04.00.15 < 04.00.18), SINUMERIK Integrate for Production 4.1 (All versions < V4.1 SP10 HF3), SINUMERIK Integrate for Production 5.1 (V5.1), SINUMERIK Manage MyMachines (All versions), SINUMERIK Manage MyMachines /Remote (All versions), SINUMERIK Manage MyMachines /Spindel Monitor (All versions), SINUMERIK Manage MyPrograms (All versions), SINUMERIK Manage MyResources /Programs (All versions), SINUMERIK Manage MyResources /Tools (All versions), SINUMERIK Manage MyTools (All versions), SINUMERIK Operate V4.8 (All versions < V4.8 SP8), SINUMERIK Operate V4.93 (All versions < V4.93 HF7), SINUMERIK Operate V4.94 (All versions < V4.94 HF5), SINUMERIK Optimize MyProgramming /NX-Cam Editor (All versions). Due to an error in a third-party dependency the ssl flags used for setting up a TLS connection to a server are overwitten with wrong settings. This results in a missing validation of the server certificate and thus in a possible TLS MITM szenario.
How severe is CVE-2021-31892?: CVE-2021-31892 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-31892 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31892?: CVE-2021-31892 primarily affects Siemens Sinumerik Analyse Mycondition Firmware. In total, 31 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-31892?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-31892 published?: CVE-2021-31892 was published on 2021-07-13 and last updated on 2026-06-17.

References

Affected products (31)

cpe:2.3:o:siemens:sinumerik_analyse_mycondition_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_analyze_myperformance_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_integrate_client_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_integrate_for_production_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_integrate_for_production_firmware:5.1:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_manage_mymachines_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_manage_myprograms_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_manage_myresources_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_manage_mytools_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.8:-:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.8:sp1:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.8:sp2:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.8:sp3:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.8:sp4:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.8:sp5:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.8:sp6:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.8:sp7:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.93:-:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.93:hotfix_1:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.93:hotfix_2:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.93:hotfix_3:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.93:hotfix_4:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.93:hotfix_5:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.93:hotfix_6:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.94:-:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.94:hotfix_1:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.94:hotfix_2:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.94:hotfix_3:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_operate_firmware:4.94:hotfix_4:*:*:*:*:*:*
cpe:2.3:o:siemens:sinumerik_optimize_myprogramming_firmware:-:*:*:*:*:*:*:*

Other CWE-295 (Improper Certificate Validation) vulnerabilities

CVE-2026-4370 — Critical (CVSS 10.0): A vulnerability was identified in Juju from version 3.2.0 until 3.6.19 and from version 4.0 until 4.0.4, where the…
CVE-2026-30836 — Critical (CVSS 10.0): Step CA is an online certificate authority for secure, automated certificate management for DevOps. Versions 0.30.0-rc6…
CVE-2025-68121 — Critical (CVSS 10.0): During session resumption in crypto/tls, if the underlying Config has its ClientCAs or RootCAs fields mutated between…
CVE-2022-20703 — Critical (CVSS 10.0): Multiple vulnerabilities in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker…
CVE-2021-1471 — Critical (CVSS 9.9): Multiple vulnerabilities in Cisco Jabber for Windows, Cisco Jabber for MacOS, and Cisco Jabber for mobile platforms…
CVE-2026-20184 — Critical (CVSS 9.8): A vulnerability in the integration of single sign-on (SSO) with Control Hub in Cisco Webex Services could have allowed…

Browse all CWE-295 (Improper Certificate Validation) vulnerabilities →