How severe is CVE-2017-6034?

CVE-2017-6034 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-6034 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-6034?

CVE-2017-6034 affects Schneider-electric Modbus Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-6034?

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

When was CVE-2017-6034 published?

CVE-2017-6034 was published on 2017-06-30 and last updated on 2026-06-17.

CVE-2017-6034

CVE-2017-6034 is a critical-severity vulnerability in Schneider-electric Modbus Firmware with a CVSS 3.x base score of 9.8. 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-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Schneider-electric Modbus Firmware
Published: 2017-06-30
Last modified: 2026-06-17

Description

An authentication bypass by capture-replay issue was discovered in Schneider Electric Modicon Modbus Protocol. Sensitive information is transmitted in cleartext in the Modicon Modbus protocol, which may allow an attacker to replay the following commands: run, stop, upload, and download.

Frequently asked questions

What is CVE-2017-6034?: An authentication bypass by capture-replay issue was discovered in Schneider Electric Modicon Modbus Protocol. Sensitive information is transmitted in cleartext in the Modicon Modbus protocol, which may allow an attacker to replay the following commands: run, stop, upload, and download.
How severe is CVE-2017-6034?: CVE-2017-6034 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-6034 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-6034?: CVE-2017-6034 affects Schneider-electric Modbus Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-6034?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2017-6034 published?: CVE-2017-6034 was published on 2017-06-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:schneider-electric:modbus_firmware:-:*:*:*:*:*:*:*

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