No exploitation reported

CVE-2017-6034

No exploitation reported by the sources we read.

Published2017-06-30
WeaknessCWE-287 · CWE-294

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

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.

Timeline

dates in UTC

2017-06-3003:29CVE 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-2017-6034?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-6034?format=csv
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Versions per branch

NVD

Schneider-electric modbus firmwareversion to verify

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

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-17-101-01 CISA1 known affected
Schneider Electric Modicon Modbus Protocol
Modicon Modbus protocol: all versions

Full record on NVD

Fix

Mitigation from the vendor CISA ICSA-17-101-01 · 1 productSchneider Electric has reported that they have introduced compensating controls to limit the exploitability of the identified vulnerabilities in many of the PLCs in the Modicon family; however, Schneider Electric recommends that users apply security measures to improve resiliency.
Mitigation from the vendor CISA ICSA-17-101-01 · 1 productSchneider Electric's Momentum M1E controllers (all versions of model 171CBU98090 and all versions of model 171CBU98091) do not have built-in compensating controls to limit the exploitability of the identified vulnerabilities
Mitigation from the vendor CISA ICSA-17-101-01 · 1 productProtect access to M1E controllers by a firewall blocking all remote/external access to Port 502.
Mitigation from the vendor CISA ICSA-17-101-01 · 1 productEnable protection based on an authentication to connect to PLC. This method relies on a feature named Application Password. Once enabled, password-based authentication is required whenever a user connects to change their application program
Mitigation from the vendor CISA ICSA-17-101-01 · 1 productEnable protection relying on an input (M340, Premium, Quantum) or a key switch in the front panel (Quantum) to reject remote connection or run/stop commands
Mitigation from the vendor CISA ICSA-17-101-01 · 1 productEnable the “Access Control List protection,” where users are able to configure the restricted IP addresses that are pre-authorized to control the PLC.

Detection

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

Sources

CISA-ADPSSVC decisionnone2026-05-28
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.19.82026-05-28
NVDCVSS 3.09.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
CNAweakness (CWE)CWE-294read 2026-10-23
NVDweakness (CWE)CWE-287read 2026-10-23
FIRST EPSSEPSS score5.5 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2017-06-30
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-6034?

Is CVE-2017-6034 actively exploited?

Active exploitation of CVE-2017-6034 has not been confirmed. Its EPSS score was 5.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-6034?

CVE-2017-6034 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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