CVE-2025-40891

mediumpriority · track · 19EPSS 0.002 · 7 %ileDEEUNLUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.18% (7th) EPSS
CVSS 4.7 · medium
Is it mine?
135 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · cisa_csaf_ot · ncsc_nl

EPSS · scored 2026-10-22

A Stored HTML Injection vulnerability was discovered in the Time Machine Snapshot Diff functionality due to improper validation of network traffic data. An unauthenticated attacker can send specially crafted network packets at two different times to inject HTML tags into asset attributes across two snapshots. Exploitation requires a victim to use the Time Machine Snapshot Diff feature on those specific snapshots and perform specific GUI actions, at which point the injected HTML renders in their browser, enabling phishing and open redirect attacks. Full XSS exploitation is prevented by input validation and Content Security Policy. Attack complexity is high due to multiple required conditions.

01

remediations

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

A vendor fix is available.

  • FixedCMCnozomi_psirt

    Upgrade to v25.5.0 or later.

  • FixedGuardiannozomi_psirt

    Upgrade to v25.5.0 or later.

  • FixedRUGGEDCOM APE1808siemens_psirt

    Upgrade Nozomi Guardian to v26.2.0. Contact customer support to receive patch and update information

  • FixedRUGGEDCOM APE1808cisa_csaf_ot

    Upgrade Nozomi Guardian to v26.2.0. Contact customer support to receive patch and update information

  • MitigationCMCnozomi_psirt

    N/A

  • MitigationGuardiannozomi_psirt

    N/A

02

cvss

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

4.7
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 0.6–4.7

v3.14.7mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 1.6 · impact 2.7
v3.14.7mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · CISA US
v3.14.7mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · NCSC-NL NL
v3.14.7mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · prodsec@nozominetworks.comexploitability 1.6 · impact 2.7
v3.14.7mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · Siemens ProductCERT DE
v3.14.7mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · Nozomi Networks PSIRT
v4.02.3lowCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/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
v4.00.6lowCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/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)
v4.02.3lowCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:Nsecondary · ENISA EU
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-79USCWE-79USCWE-79USCWE-79USCWE-79US
05

affected products (135)

Products and version ranges known to be affected.

showing 20 of 135
06

advisories (4)

Vendor and ecosystem advisories describing this.

  • NCSC-2026-0005Kwetsbaarheden verholpen in Siemens productenNL2026-01-13csaf · ncsc_nlNL

    Siemens heeft kwetsbaarheden verholpen in diverse producten als Industrial Edge Devices, SCALANCE, SIMATIC, SIPLUS en Telecontrol Server.

  • NN-2025:12-01HTML injection in in Time Machine functionality in Guardian/CMC before 25.5.02025-12-18csaf · nozomi_psirtUS
  • SSA-827968SSA-827968: Vulnerability in Nozomi Guardian/CMC Before V26.2.0 on RUGGEDCOM APE1808 Devices2026-01-13csaf · 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 has released a new version for RUGGEDCOM APE1808 and recommends to update to the latest version.

  • ICSA-26-015-07Siemens RUGGEDCOM APE1808 Devices2026-01-13icsa · 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 has released a new version for RUGGEDCOM APE1808 and recommends to update to the latest version.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcisa_csaf_otncsc_nlnozomi_psirtsiemens_psirtNVDCVE.orgMITRE
published 2025-12-18modified 2026-06-17
09

references (4)

External citations — patches, advisories, analysis.

scry

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