CVE-2019-6831 — A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability ex

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in BMXNOR0200H Ethernet / Serial RTU module (all firmware versions), which could cause disconnection of active connections when an unusually high number of IEC 60870- 5-104 packets are received b

01What is this vulnerability?

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in BMXNOR0200H Ethernet / Serial RTU module (all firmware versions), which could cause disconnection of active connections when an unusually high number of IEC 60870- 5-104 packets are received by the module on port 2404/TCP.

02Affected products

Vendor	Product	Versions
Schneider Electric SE	BMXNOR0200H Ethernet / Serial RTU module	all firmware versions

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: 2019-09-17T19:22:59.000Z
• Last modified: 2024-08-04T20:31:04.375Z

09References

• www.schneider-electric.com — https://www.schneider-electric.com/en/download/document/SEVD-2019-225-03/
• security.cse.iitk.ac.in — https://security.cse.iitk.ac.in/responsible-disclosure