No exploitation reportedFix available

CVE-2018-4840

Q: Is CVE-2018-4840 actively exploited?

Active exploitation of CVE-2018-4840 has not been confirmed. Its EPSS score was 1.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2018-4840?

CVE-2018-4840 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

No exploitation reported by the sources we read.

Published2018-03-08
Fixed in4.92
WeaknessCWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability has been identified in DIGSI 4 (All versions < V4.92), EN100 Ethernet module DNP3 variant (All versions < V1.05.00), EN100 Ethernet module IEC 104 variant (All versions), EN100 Ethernet module IEC 61850 variant (All versions < V4.30), EN100 Ethernet module Modbus TCP variant (All versions), EN100 Ethernet module PROFINET IO variant (All versions). The device engineering mechanism allows an unauthenticated remote user to upload a modified device configuration overwriting access authorization passwords.

Timeline

dates in UTC

2018-03-0817:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-4840?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-4840?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Siemens digsi 4

Branch	Affected	Fixed in	Source
4.92	< 4.92	4.92	NVD

Siemens en100 ethernet module dnp3 firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Siemens en100 ethernet module iec 104 firmwareversion to verify

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

6 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-18-067-01 CISA6 known affected
Siemens SIPROTEC 4, SIPROTEC Compact, DIGSI 4, and EN100 Ethernet Module (Update D)
DIGSI 4 · EN100 Ethernet module DNP3 variant · EN100 Ethernet module IEC 104 variant · +3 more

Full record on NVD

Fix

Update Siemens digsi 4 to 4.92
Vendor fix CISA ICSA-18-067-01 · 1 productUpdate to V4.92
Vendor fix CISA ICSA-18-067-01 · 1 productUpdate to V1.05.00 and configure DIGSI 4 connection password
Vendor fix CISA ICSA-18-067-01 · 1 productUpdate to V4.30 and configure DIGSI 4 connection password
Mitigation from the vendor CISA ICSA-18-067-01 · 6 productsApply secure substation concept and Defense-in-Depth (see https://www.siemens.com/gridsecurity) or contact customer care to find specific solutions.
No fix available, says the vendor CISA ICSA-18-067-01 · 3 productsCurrently no remediation is available

Advisories and patches

cert-portal.siemens.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-306read 2026-10-23
NVDweakness (CWE)CWE-306read 2026-10-23
FIRST EPSSEPSS score1.8 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published: 2018-03-08
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-4840?

Is CVE-2018-4840 actively exploited?

Active exploitation of CVE-2018-4840 has not been confirmed. Its EPSS score was 1.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-4840?

CVE-2018-4840 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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