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Fencer Vulns
critical 9.8

CVE-2020-15786 json

A vulnerability has been identified in SIMATIC HMI Basic Panels 2nd Generation (incl.

published 2020-09-09 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-7769

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

A vulnerability has been identified in SIMATIC HMI Basic Panels 2nd Generation (incl. SIPLUS variants) (All versions < V16), SIMATIC HMI Comfort Panels (incl. SIPLUS variants) (All versions <= V16), SIMATIC HMI Mobile Panels (All versions <= V16), SIMATIC HMI Unified Comfort Panels (All versions <= V16). Affected devices insufficiently block excessive authentication attempts. This could allow a remote attacker to discover user passwords and obtain access to the Sm@rt Server via a brute-force attack.

Vendor advisories

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

cisa ICSA-20-252-06 updated cvss 6.5

Siemens SIMATIC HMI Products (Update A)

  • Siemens SIMATIC HMI Basic Panels 2nd Generation (incl. SIPLUS variants) <V16 Siemens SIMATIC HMI Comfort Panels (incl. SIPLUS variants) <=V16 Siemens SIMATIC HMI Mobile Panels <=V16
    affected: fixed in V16, mitigation support.industry.siemens.com
  • Siemens SIMATIC HMI Unified Comfort Panels <=V16
    affected: fixed in V16, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
5 mo ago

Exploit prediction

1.48% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • Siemens SIMATIC HMI Basic Panels 2nd Generation (incl. SIPLUS variants)
  • Siemens SIMATIC HMI Comfort Panels (incl. SIPLUS variants)
  • Siemens SIMATIC HMI Mobile Panels
  • Siemens SIMATIC HMI Unified Comfort Panels

Classification

Weakness
  • CWE-307 Improper Restriction of Excessive Authentication Attempts

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.