Is CVE-2018-4840 in the CISA KEV catalog?

No. CVE-2018-4840 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-4840?

CVE-2018-4840 has a CVSS v3 base score of 7.5 (HIGH).

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

CVE-2018-4840 has an EPSS score of 1.80% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-4840?

Upgrade digsi 4 to 4.92 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2018-4840

HIGHEPSS 76th pctl

7.5

CVSS v3

NVD

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.

CWE-306Missing Authentication for Critical Function

How to fix

Remediation Available

digsi 4NVD

Affected:< 4.92Fixed in:4.92CVE-2018-4840derived from NVD

en100 ethernet module iec 61850 firmwareNVD

Affected:< 4.30Fixed in:4.30CVE-2018-4840derived from NVD

siprotec 4 7sj66 firmwareNVD

Affected:< 4.30Fixed in:4.30CVE-2018-4840derived from NVD

siprotec compact 7sj80 firmwareNVD

Affected:< 4.77Fixed in:4.77CVE-2018-4840derived from NVD

siprotec compact 7sk80 firmwareNVD

Affected:< 4.77Fixed in:4.77CVE-2018-4840derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

1.80%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Patch1

cert-portal.siemens.com

Third-Party Advisory1

ics-cert.us-cert.gov

Related Vulnerabilities

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-10271	High	7.5	100%	KEV + Ransom	-
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2025-3248	Critical	9.8	100%	KEV	Fix
CVE-2022-1388	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2021-37415	Critical	9.8	100%	KEV	-
CVE-2023-21839	High	7.5	100%	KEV	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.