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Fencer Vulns
low 2.3

CVE-2020-16230 json

All version of Ewon Flexy and Cosy prior to 14.1 use wildcards such as (*) under which domains can request resources.

published 2020-09-18 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-8196

cvss
2.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits
0
none known

Summary

All version of Ewon Flexy and Cosy prior to 14.1 use wildcards such as (*) under which domains can request resources. An attacker with local access and high privileges could inject scripts into the Cross-origin Resource Sharing (CORS) configuration that could abuse this vulnerability, allowing the attacker to retrieve limited confidential information through sniffing.

Patch / fix

  • hms-networks ewon_flexy_firmware 14.1
  • hms-networks ewon_cosy_firmware 14.1

Vendor advisories

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

cisa ICSA-20-254-03 updated cvss 2.3

HMS Networks Ewon Flexy and Cosy

  • HMS Networks Flexy and Cosy < 14.1
    affected: mitigation “Update firmware to the latest version available.” ewon.biz

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

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 2.3 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • n/a HMS Networks Ewon Flexy and Cosy

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.