CVE-2021-27385

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). A remote attacker could send specially crafted packets to SmartVNC device layout handler on client side, which could influence the amount of resources consumed and result in a Denial-of-Service (infinite loop) condition.

Published: 2021-05-12 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-27385 is rated Moderate Risk (61/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.53%). EPSS rose +2.02% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-27385

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.51% 2.53% +2.02%
2 2026-05-14 0.30% 0.51% +0.21%
3 2025-11-21 — 0.30% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-27385

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-27385

Affected software / configurations for CVE-2021-27385

Vendor Product Version Raw CPE
siemens simatic_wincc_runtime_advanced < 16 cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:*:*:*:*:*:*:*:*
siemens simatic_wincc_runtime_advanced 16 cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:-:*:*:*:*:*:*
siemens simatic_wincc_runtime_advanced 16 cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:update1:*:*:*:*:*:*
siemens simatic_wincc_runtime_advanced 16 cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:update2:*:*:*:*:*:*
siemens simatic_wincc_runtime_advanced 16 cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:update3:*:*:*:*:*:*
siemens sinamics_sh150_firmware — cpe:2.3:o:siemens:sinamics_sh150_firmware:*:*:*:*:*:*:*:*
siemens sinamics_sm150i_firmware — cpe:2.3:o:siemens:sinamics_sm150i_firmware:*:*:*:*:*:*:*:*
siemens sinamics_gh150_firmware — cpe:2.3:o:siemens:sinamics_gh150_firmware:*:*:*:*:*:*:*:*
siemens sinamics_gl150_firmware — cpe:2.3:o:siemens:sinamics_gl150_firmware:*:*:*:*:*:*:*:*
siemens sinamics_gm150_firmware — cpe:2.3:o:siemens:sinamics_gm150_firmware:*:*:*:*:*:*:*:*
siemens sinamics_sl150_firmware — cpe:2.3:o:siemens:sinamics_sl150_firmware:*:*:*:*:*:*:*:*
siemens sinamics_sm120_firmware — cpe:2.3:o:siemens:sinamics_sm120_firmware:*:*:*:*:*:*:*:*
siemens sinamics_sm150_firmware — cpe:2.3:o:siemens:sinamics_sm150_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware < 16 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:16:-:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:16:update1:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:16:update2:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:16:update3:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware < 16 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:*:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:-:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:update1:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:update2:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:update3:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware < 16 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:16:-:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:16:update1:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:16:update2:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:16:update3:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_22\"_firmware < 16 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_22\"_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_22\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_22\"_firmware:16:-:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_22\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_22\"_firmware:16:update1:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_22\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_22\"_firmware:16:update2:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_22\"_firmware 16 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_22\"_firmware:16:update3:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp400f_firmware < 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp400f_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp400f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp400f_firmware:16:-:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp400f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp400f_firmware:16:update1:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp400f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp400f_firmware:16:update2:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp400f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp400f_firmware:16:update3:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp700_firmware < 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp700_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp700_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp700_firmware:16:-:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp700_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp700_firmware:16:update1:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp700_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp700_firmware:16:update2:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp700_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp700_firmware:16:update3:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp700f_firmware < 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp700f_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp700f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp700f_firmware:16:-:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp700f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp700f_firmware:16:update1:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp700f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp700f_firmware:16:update2:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp700f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp700f_firmware:16:update3:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp900_firmware < 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp900_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp900_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp900_firmware:16:-:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp900_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp900_firmware:16:update1:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp900_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp900_firmware:16:update2:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp900_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp900_firmware:16:update3:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp900f_firmware < 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp900f_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp900f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp900f_firmware:16:-:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp900f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp900f_firmware:16:update1:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp900f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp900f_firmware:16:update2:*:*:*:*:*:*
siemens simatic_hmi_ktp_mobile_panels_ktp900f_firmware 16 cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp900f_firmware:16:update3:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware < 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:-:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update1:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update2:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update3:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update4:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_7\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update5:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware < 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:-:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update1:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update2:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update3:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update4:*:*:*:*:*:*
siemens simatic_hmi_comfort_outdoor_panels_15\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update5:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware < 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:*:*:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:-:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:update1:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:update2:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:update3:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:update4:*:*:*:*:*:*
siemens simatic_hmi_comfort_panels_4\"_firmware 15.1 cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:update5:*:*:*:*:*:*

References for CVE-2021-27385

cvelogic Threat Intelligence