CVE-2019-6842 — A CWE-755: Improper Handling of Exceptional Conditions vulnerability exists in M

A CWE-755: Improper Handling of Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon BMxCRA and 140CRA modules (all firmware versions), which could cause a Denial of Service attack on the PLC when upgrading the firmware with a missing web server imag

01What is this vulnerability?

A CWE-755: Improper Handling of Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon BMxCRA and 140CRA modules (all firmware versions), which could cause a Denial of Service attack on the PLC when upgrading the firmware with a missing web server image inside the package using FTP protocol.

02Affected products

Vendor	Product	Versions
n	a / Modicon M580, Modicon M340, and Modicon BMxCRA / 140CRA modules (see notification for version info)	Modicon M580, Modicon M340, and Modicon BMxCRA / 140CRA modules (see notification for version info)

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-10-29T14:47:16.000Z
• Last modified: 2024-08-04T20:31:04.358Z

09References

• www.se.com — https://www.se.com/ww/en/download/document/SEVD-2019-281-02/