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Fencer Vulns
critical 10.0

CVE-2020-12493 json

Critical Vulnerability in SWARCO CPU LS4000

published 2020-05-29 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4795

cvss
10.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

An open port used for debugging in SWARCOs CPU LS4000 Series with versions starting with G4... grants root access to the device without access control via network. A malicious user could use this vulnerability to get access to the device and disturb operations with connected devices.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-154-06 updated cvss 10.0

SWARCO CPU LS4000

  • SWARCO TRAFFIC SYSTEMS CPU LS4000 >=G4
    affected: mitigation “SWARCO TRAFFIC SYSTEMS released a patch to fix the vulnerability and close the port. Please contact SWARCO TRAFFIC SYSTEMS for further information.” cert.vde.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.40% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • SWARCO CPU LS4000

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.