CVE-2026-33391

mediumpriority · track · 0OT risk · elevatedEPSS 0.004 · 28 %ileDENLUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.36% (28th) EPSS
CVSS 5.4 · medium
Is it mine?
242 products
Check your exposure
Who says so?
4 sources
cisa_csaf_ot · ncsc_nl · nozomi_psirt · siemens_psirt

EPSS · scored 2026-10-22

An access control vulnerability was discovered in the Smart Polling configuration functionality due to insufficient validation of user privileges. An authenticated user with limited privileges can remotely bypass the intended access control of the web management interface and modify the Smart Polling discovery configuration. This allows the attacker to disrupt the visibility of assets in the monitored network.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedCMCnozomi_psirt

    Upgrade to v26.3.0 or later.

  • FixedGuardiannozomi_psirt

    Upgrade to v26.3.0 or later.

  • FixedRUGGEDCOM APE1808siemens_psirt

    Contact customer support to receive patch and update information

  • FixedRUGGEDCOM APE1808cisa_csaf_ot

    Contact customer support to receive patch and update information

  • MitigationCMCnozomi_psirt

    Use internal firewall features to limit access to the web management interface. Review all accounts with access to it and delete unnecessary ones. Review your Smart Polling discovery configuration.

  • MitigationGuardiannozomi_psirt

    Use internal firewall features to limit access to the web management interface. Review all accounts with access to it and delete unnecessary ones. Review your Smart Polling discovery configuration.

02

cvss

Technical severity, 0–10. One row per scoring source.

5.4
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.3–5.4

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Lsecondary · Siemens ProductCERT DE
v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Lsecondary · Nozomi Networks PSIRT
v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Lsecondary · NCSC-NL NL
v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Lsecondary · prodsec@nozominetworks.comexploitability 2.8 · impact 2.5
v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:Lsecondary · CISA US
v4.05.3mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · prodsec@nozominetworks.com
v4.01.3lowCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-863USCWE-863USCWE-863USCWE-863USCWE-863US
05

affected products (242)

Products and version ranges known to be affected.

showing 20 of 242
06

advisories (4)

Vendor and ecosystem advisories describing this.

  • NCSC-2026-0415Kwetsbaarheden verholpen in Siemens-productenNL2026-10-13csaf · ncsc_nlNL

    Siemens heeft kwetsbaarheden verholpen in diverse producten zoals Desigo, Industrial Plus, RUGGEDCOM, SIMATIC en SIPLUS.

  • NN-2026:17-01Incorrect authorization in Smart Polling configuration in Guardian/CMC before 26.3.02026-09-08csaf · nozomi_psirtUS
  • SSA-911336SSA-911336: Multiple Vulnerabilities in Nozomi Guardian/CMC on RUGGEDCOM APE1808 Devices2026-10-13csaf · siemens_psirtDE

    Nozomi Networks has published information on vulnerabilities in Nozomi Guardian/CMC. This advisory lists the related Siemens Industrial products affected by these vulnerabilities. Siemens recommends to contact customer support to receive patch and update information.

  • ICSA-26-295-18Siemens RUGGEDCOM APE1808 Devices2026-10-13icsa · cisa_csaf_otUS

    Nozomi Networks has published information on vulnerabilities in Nozomi Guardian/CMC. This advisory lists the related Siemens Industrial products affected by these vulnerabilities. Siemens recommends to contact customer support to receive patch and update information.

07

sources

Which sources assert this record, and when.

cisa_csaf_otncsc_nlnozomi_psirtsiemens_psirtNVDCVE.orgMITRE
published 2026-09-08modified 2026-10-15
08

references (2) nvd

External citations — patches, advisories, analysis.

scry

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