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CVE-2018-7758· NVD / CVE Program· CNA schneider

A denial of service vulnerability exists in Schneider Electric's MiCOM Px4x (P540 range excluded) with legacy Ethernet board, MiCOM P540D Ra

A denial of service vulnerability exists in Schneider Electric's MiCOM Px4x (P540 range excluded) with legacy Ethernet board, MiCOM P540D Range with Legacy Ethernet Board, and MiCOM Px4x Rejuvenated could lose network communication in case of TCP/IP open requests on port 20000 (DNP3oE) if an older TCI/IP session is still open with identical IP address and port number.

MediumCVSS 6.5 · v3.0—No exploit No fix recorded
Published
Apr 18, 2018
Updated
Jun 16, 2026
EPSS
0.6% · 48th percentile
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Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

Affected systems

VendorProduct
schneider-electricmicom p141 firmware
schneider-electricmicom p141
schneider-electricmicom p142 firmware
schneider-electricmicom p142
schneider-electricmicom p143 firmware
schneider-electricmicom p143
schneider-electricmicom p145 firmware
schneider-electricmicom p145
schneider-electricmicom p642 firmware
schneider-electricmicom p642
schneider-electricmicom p643 firmware
schneider-electricmicom p643

and 34 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • schneider-electric micom p141 firmwareall versions
  • schneider-electric micom p142 firmwareall versions
  • schneider-electric micom p143 firmwareall versions
  • schneider-electric micom p145 firmwareall versions
  • schneider-electric micom p441 firmwareall versions
  • schneider-electric micom p442 firmwareall versions
  • schneider-electric micom p443 firmwareall versions
  • schneider-electric micom p444 firmwareall versions
  • schneider-electric micom p445 firmwareall versions
  • schneider-electric micom p446 firmwareall versions
  • schneider-electric micom p541 firmwareall versions
  • schneider-electric micom p542 firmwareall versions
  • schneider-electric micom p543 firmwareall versions
  • schneider-electric micom p544 firmwareall versions
  • schneider-electric micom p545 firmwareall versions
  • schneider-electric micom p546 firmwareall versions
  • schneider-electric micom p642 firmwareall versions
  • schneider-electric micom p643 firmwareall versions
  • schneider-electric micom p645 firmwareall versions
  • schneider-electric micom p746 firmwareall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (schneider). Independent of NVD's CPE analysis and usually ahead of it.

  • Schneider Electric SE MiCOM P540D Range with Legacy Ethernet Board

    • MiCOM P540D Range with Legacy Ethernet Board, MiCOM Px4x with Legacy Ethernet Board, MiCOM Px4x Rejuvenatedaffected

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-613 · Insufficient Session Expiration

CVSS vector

CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records