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Fencer Vulns
critical 9.8

CVE-2021-27384 json

A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl.

published 2021-05-12 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14139

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Outdoor Panels V16 7\" & 15\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI Comfort Panels V15 4\" - 22\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Panels V16 4\" - 22\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V15.1 Update 6), SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V16 Update 4), SIMATIC WinCC Runtime Advanced V15 (All versions < V15.1 Update 6), SIMATIC WinCC Runtime Advanced V16 (All versions < V16 Update 4), SINAMICS GH150 (All versions), SINAMICS GL150 (with option X30) (All versions), SINAMICS GM150 (with option X30) (All versions), SINAMICS SH150 (All versions), SINAMICS SL150 (All versions), SINAMICS SM120 (All versions), SINAMICS SM150 (All versions), SINAMICS SM150i (All versions). SmartVNC has an out-of-bounds memory access vulnerability in the device layout handler, represented by a binary data stream on client side, which can potentially result in code execution.

Patch / fix

  • siemens simatic_wincc_runtime_advanced 15.1, 16
  • siemens simatic_hmi_comfort_outdoor_panels_7"_firmware 15.1, 16
  • siemens simatic_hmi_comfort_outdoor_panels_15"_firmware 15.1, 16
  • siemens simatic_hmi_comfort_panels_4"_firmware 15.1, 16
  • siemens simatic_hmi_comfort_panels_22"_firmware 15.1, 16
  • siemens simatic_hmi_ktp_mobile_panels_ktp400f_firmware 15.1, 16
  • siemens simatic_hmi_ktp_mobile_panels_ktp700_firmware 15.1, 16
  • siemens simatic_hmi_ktp_mobile_panels_ktp700f_firmware 15.1, 16
  • siemens simatic_hmi_ktp_mobile_panels_ktp900_firmware 15.1, 16
  • siemens simatic_hmi_ktp_mobile_panels_ktp900f_firmware 15.1, 16

Vendor advisories

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

cisa ICSA-21-131-04 updated cvss 9.8

Siemens SINAMICS Medium Voltage Products Remote Access (Update B)

  • Siemens SINAMICS GH150 Siemens SINAMICS GL150 (with option X30) Siemens SINAMICS GM150 (with option X30) Siemens SINAMICS SH150 Siemens SINAMICS SL150 Siemens SINAMICS SM120
    +2 more products
    Siemens SINAMICS SM150 Siemens SINAMICS SM150i
    affected: mitigation, no fix available

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

cisa ICSA-21-131-12 updated cvss 9.8

Siemens SIMATIC SmartVNC HMI WinCC Products (Update B)

  • Siemens SIMATIC HMI Comfort Outdoor Panels V15 7" & 15" (incl. SIPLUS variants) <V15.1_Update_6
    affected: fixed in V15.1, mitigation support.industry.siemens.com
  • Siemens SIMATIC HMI Comfort Outdoor Panels V16 7" & 15" (incl. SIPLUS variants) <V16_Update_4
    affected: fixed in V16, mitigation support.industry.siemens.com
  • Siemens SIMATIC HMI Comfort Panels V15 4" - 22" (incl. SIPLUS variants) <V15.1_Update_6
    affected: fixed in V15.1, mitigation support.industry.siemens.com
  • Siemens SIMATIC HMI Comfort Panels V16 4" - 22" (incl. SIPLUS variants) <V16_Update_4
    affected: fixed in V16, mitigation support.industry.siemens.com
  • Siemens SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F <V15.1_Update_6
    affected: fixed in V15.1, mitigation support.industry.siemens.com
  • Siemens SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F <V16_Update_4
    affected: fixed in V16, mitigation support.industry.siemens.com
  • Siemens SIMATIC WinCC Runtime Advanced V15 <V15.1_Update_6
    affected: fixed in V15.1, mitigation support.industry.siemens.com
  • Siemens SIMATIC WinCC Runtime Advanced V16 <V16_Update_4
    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

2.61% chance of exploitation in the next 30 days, higher than 85% 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 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Siemens SIMATIC HMI Comfort Outdoor Panels V15 7\" & 15\" (incl. SIPLUS variants)
  • Siemens SIMATIC HMI Comfort Outdoor Panels V16 7\" & 15\" (incl. SIPLUS variants)
  • Siemens SIMATIC HMI Comfort Panels V15 4\" - 22\" (incl. SIPLUS variants)
  • Siemens SIMATIC HMI Comfort Panels V16 4\" - 22\" (incl. SIPLUS variants)
  • Siemens SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F
  • Siemens SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F
  • Siemens SIMATIC WinCC Runtime Advanced V15
  • Siemens SIMATIC WinCC Runtime Advanced V16
  • Siemens SINAMICS GH150
  • Siemens SINAMICS GL150 (with option X30)
  • Siemens SINAMICS GM150 (with option X30)
  • Siemens SINAMICS SH150
  • Siemens SINAMICS SL150
  • Siemens SINAMICS SM120
  • Siemens SINAMICS SM150
  • Siemens SINAMICS SM150i

Classification

Weakness
  • CWE-788 Access of Memory Location After End of Buffer

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.