7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.5 High
AI Score
Confidence
Low
0.038 Low
EPSS
Percentile
91.9%
Successful exploitation of these LibVNC vulnerabilities could allow remote code execution, information disclosure, and denial-of-service attacks.
Siemens reports these vulnerabilities affect the following SIMATIC Industrial Thin Clients:
Multiple LibVNC vulnerabilities in the affected products could allow remote code execution, information disclosure, and denial-of-service attacks under certain conditions.
CVE-2017-18922, CVE-2018-20019, CVE-2018-20748, CVE-2018-20749, CVE-2018-20750, CVE-2018-21247, CVE-2019-15681, CVE-2019-15690, CVE-2019-20788, CVE-2019-20839, CVE-2019-20840, CVE-2020-14396, CVE-2020-14397, CVE-2020-14398, CVE-2020-14401, CVE-2020-14402, CVE-2020-14403, CVE-2020-14404, CVE-2020-14405 have been assigned to these vulnerabilities. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
• CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems
• COUNTRIES/AREAS DEPLOYED: Worldwide
• COMPANY HEADQUARTERS LOCATION: Germany
Siemens reported these vulnerabilities to CISA.
Siemens has released updates for the affected products and recommends users update to the latest versions:
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens’ Operational Guidelines for Industrial Security and to follow the recommendations in the product manuals.
Additional information on Industrial Security by Siemens can be found at: <https://www.siemens.com/industrialsecurity>
Please see Siemens’ security advisory SSA-390195 for more information.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-18922
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-20019
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-20748
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-20749
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-20750
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-21247
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-15681
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-15690
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-20788
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-20839
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-20840
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-14396
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-14397
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-14398
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-14401
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-14402
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-14403
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-14404
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-14405
cert-portal.siemens.com/operational-guidelines-industrial-security.pdf
cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
cwe.mitre.org/data/definitions/1035.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109804128/
support.industry.siemens.com/cs/ww/en/view/109804128/
support.industry.siemens.com/cs/ww/en/view/109804128/
support.industry.siemens.com/cs/ww/en/view/109804128/
support.industry.siemens.com/cs/ww/en/view/109804128/
support.industry.siemens.com/cs/ww/en/view/109804128/
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20SIMATIC%20ITC+https://www.cisa.gov/news-events/ics-advisories/icsa-21-350-12
www.cisa.gov/uscert/ics
www.cisa.gov/uscert/ics
www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
www.cisa.gov/uscert/ics/recommended-practices
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
www.cisa.gov/uscert/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-21-350-12&title=Siemens%20SIMATIC%20ITC
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
www.instagram.com/cisagov
www.linkedin.com/company/cybersecurity-and-infrastructure-security-agency
www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-21-350-12
www.oig.dhs.gov/
www.siemens.com/industrialsecurity
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-21-350-12
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20SIMATIC%20ITC&body=www.cisa.gov/news-events/ics-advisories/icsa-21-350-12
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.5 High
AI Score
Confidence
Low
0.038 Low
EPSS
Percentile
91.9%