How severe is CVE-2018-4840?

CVE-2018-4840 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2018-4840 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-4840?

CVE-2018-4840 primarily affects Siemens Siprotec Compact 7sj80 Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-4840?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-4840 published?

CVE-2018-4840 was published on 2018-03-08 and last updated on 2026-06-17.

CVE-2018-4840

CVE-2018-4840 is a high-severity vulnerability in Siemens Siprotec Compact 7sj80 Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Siemens Siprotec Compact 7sj80 Firmware
Published: 2018-03-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2018-4840?: 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.
How severe is CVE-2018-4840?: CVE-2018-4840 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2018-4840 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-4840?: CVE-2018-4840 primarily affects Siemens Siprotec Compact 7sj80 Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-4840?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-4840 published?: CVE-2018-4840 was published on 2018-03-08 and last updated on 2026-06-17.

References

Affected products (9)

cpe:2.3:o:siemens:siprotec_compact_7sj80_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_compact_7sk80_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:siprotec_4_7sj66_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:digsi_4:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:en100_ethernet_module_iec_104_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:en100_ethernet_module_dnp3_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:en100_ethernet_module_modbus_tcp_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:en100_ethernet_module_profinet_io_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:en100_ethernet_module_iec_61850_firmware:*:*:*:*:*:*:*:*

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