CVE-2021-27386 Security Vulnerability & Exploit Details

CVE-2021-27386
Vulnerability Scoring

7.5

/10

Very High Risk

Highly exploitable, CVE-2021-27386 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: None
No privileges are required for exploitation.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2021-27386 Details

Status: Modified

Last updated: 🕠 21 Nov 2024, 05:57 UTC
Originally published on: 🕑 12 May 2021, 14:15 UTC

Time between publication and last update: 1288 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVE-2021-27386 Vulnerability Summary

CVE-2021-27386: 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 a heap allocation leak vulnerability in the device layout handler on client side, which could result in a Denial-of-Service condition.

Assessing the Risk of CVE-2021-27386

Access Complexity Graph

The exploitability of CVE-2021-27386 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2021-27386

With low attack complexity and no required privileges, CVE-2021-27386 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2021-27386, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2021-27386, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: None
CVE-2021-27386 has no significant impact on data confidentiality.
Integrity: None
CVE-2021-27386 poses no threat to data integrity.
Availability: High
CVE-2021-27386 can disrupt system operations, potentially causing complete denial of service (DoS).

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.595% (probability of exploit)

EPSS Percentile: 78.63% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 21.370000000000005% of others.

CVE-2021-27386 References

External References

CWE Common Weakness Enumeration

CWE-401

Vulnerable Configurations

cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:-:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:-:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:update1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:update1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:update2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:update2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:update3:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:update3:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:update4:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:update4:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:update5:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:15.1:update5:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:update1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:update1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:update2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:update2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:update3:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc_runtime_advanced:16:update3:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_sh150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_sh150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_sh150:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_sh150:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_sm150i_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_sm150i_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_sm150i:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_sm150i:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_gh150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_gh150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_gh150:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_gh150:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_gl150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_gl150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_gl150:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_gl150:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_gm150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_gm150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_gm150:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_gm150:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_sl150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_sl150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_sl150:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_sl150:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_sm120_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_sm120_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_sm120:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_sm120:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_sm150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:sinamics_sm150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_sm150:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:sinamics_sm150:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:-:*:*:*:*:*:*
cpe:2.3:o: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:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update1:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update2:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update2:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update3:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update3:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update4:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update4:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:15.1:update5:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:16:-:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:16:update2:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:16:update2:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_7\"_firmware:16:update3:*:*:*:*:*:*
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cpe:2.3:h:siemens:simatic_hmi_comfort_outdoor_panels_7\":-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_hmi_comfort_outdoor_panels_7\":-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:-:*:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:-:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update1:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update2:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update2:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update3:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update4:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update5:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:15.1:update5:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:-:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:-:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:update1:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:update1:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:update2:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:update2:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:update3:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_outdoor_panels_15\"_firmware:16:update3:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_hmi_comfort_outdoor_panels_15\":-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_hmi_comfort_outdoor_panels_15\":-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:-:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:-:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:update1:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:update2:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:update2:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:update3:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:update4:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:15.1:update5:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:16:-:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:16:update1:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:16:update2:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:16:update3:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_panels_4\"_firmware:16:update3:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_hmi_comfort_panels_4\":-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_hmi_comfort_panels_4\":-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_comfort_panels_22\"_firmware:-:*:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_panels_22\"_firmware:15.1:-:*:*:*:*:*:*
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cpe:2.3:o:siemens:simatic_hmi_comfort_panels_22\"_firmware:16:update3:*:*:*:*:*:*
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cpe:2.3:h:siemens:simatic_hmi_comfort_panels_22\":-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_hmi_ktp_mobile_panels_ktp400f_firmware:14.0:*:*:*:*:*:*:*
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