CVE-2018-7830

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-11-30 · updated 2026-06-17
Weakness: CWE-113

Description

Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') vulnerability exists in the embedded web servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200 where a denial of service can occur for ~1 minute by sending a specially crafted HTTP request.

Affected products

Schneider-Electric Modicom Bmxnor0200H Firmware: all versions
Schneider-Electric Modicom M340 Firmware: all versions
Schneider-Electric Modicom Premium Firmware: all versions
Schneider-Electric Modicom Quantum Firmware: all versions

References

https://www.schneider-electric.com/en/download/document/SEVD-2018-327-01/
https://www.tenable.com/security/research/tra-2018-38
https://www.schneider-electric.com/en/download/document/SEVD-2018-327-01/
https://www.tenable.com/security/research/tra-2018-38

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