No exploitation reportedFix available

CVE-2018-4839

Q: Is CVE-2018-4839 actively exploited?

Active exploitation of CVE-2018-4839 has not been confirmed. Its EPSS score was 0.6% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2018-4839?

CVE-2018-4839 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

No exploitation reported by the sources we read.

Published2018-03-08
Fixed in4.92
WeaknessCWE-326

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), Other SIPROTEC 4 relays (All versions), Other SIPROTEC Compact relays (All versions), SIPROTEC 4 7SD80 (All versions < V4.70), SIPROTEC 4 7SJ61 (All versions < V4.96), SIPROTEC 4 7SJ62 (All versions < V4.96), SIPROTEC 4 7SJ64 (All versions < V4.96), SIPROTEC 4 7SJ66 (All versions < V4.30), SIPROTEC Compact 7SJ80 (All versions < V4.77), SIPROTEC Compact 7SK80 (All versions < V4.77). An attacker with local access to the engineering system or in a privileged network position and able to obtain certain network traffic could possibly reconstruct access authorization passwords.

Timeline

dates in UTC

2018-03-0817:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 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-2018-4839?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-4839?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 CISA15 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 · +12 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
Vendor fix CISA ICSA-18-067-01 · 1 productUpdate to V4.70
Vendor fix CISA ICSA-18-067-01 · 3 productsUpdate to V4.96
Vendor fix CISA ICSA-18-067-01 · 1 productUpdate to V4.30

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 3.05.3read 2026-10-23
NVDCVSS 2.03.5read 2026-10-23
CNAweakness (CWE)CWE-326read 2026-10-23
FIRST EPSSEPSS score0.6 %2026-10-23

Technical details

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

Frequently asked questions

What is CVE-2018-4839?

Is CVE-2018-4839 actively exploited?

Active exploitation of CVE-2018-4839 has not been confirmed. Its EPSS score was 0.6% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-4839?

CVE-2018-4839 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

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