CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
58.8%
This updated advisory is a follow-up to the updated advisory titled ICSA-19-099-03 Siemens Industrial Products with OPC UA (Update G) that was posted April 14, 2022, on the ICS webpage on www.cisa.gov/ics.
Successful exploitation of this vulnerability could cause a denial-of-service condition on the affected service or device.
The following Siemens industrial products are affected:
--------- Begin Update H Part 1 of 2 ---------
--------- End Update H Part 1 of 2 ---------
4.2.1 UNCAUGHT EXCEPTION CWE-248
Specially crafted network packets sent to affected devices on Port 4840/TCP could allow an unauthenticated remote attacker to cause a denial-of-service condition in the OPC communication or crash the device.
An attacker with network access to the affected systems could exploit the vulnerability. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise availability of the OPC communication.
CVE-2019-6575 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Siemens ProductCERT reported this vulnerability to CISA. Artem Zinenko of Kaspersky identified that SIPLUS is also affected.
Siemens currently has updates for the following products:
SIMATIC ET 200 Open Controller CPU 1515SP PC2: Update to v2.7
--------- Begin Update H Part 2 of 2 ---------
--------- End Update H Part 2 of 2 ---------
For the balance of the listed products, Siemens is preparing further updates and recommends users apply the following specific workarounds and mitigations to reduce risk until patches are available:
Siemens recommends users configure their environment according to Siemensβ operational guidelines for Industrial Security (Download) and follow the recommendations in the product manuals.
Additional information on industrial security by Siemens can be found at: <https://www.siemens.com/industrialsecurity>
For more information on the vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-307392
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-12-146-01BβTargeted 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 this vulnerability.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-6575
www.siemens.com/cert/advisories
assets.new.siemens.com/siemens/assets/public.1502968141.411e91564a2d259ecd4b6c79b51f89c044b3de81.operational-guidelines-industrial-security-en.pdf
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-19-099-03
cwe.mitre.org/data/definitions/248.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109478459
support.industry.siemens.com/cs/ww/en/view/109478528
support.industry.siemens.com/cs/ww/en/view/109746207
support.industry.siemens.com/cs/ww/en/view/109759122
support.industry.siemens.com/cs/ww/en/view/109763202
support.industry.siemens.com/cs/ww/en/view/109763890
support.industry.siemens.com/cs/ww/en/view/109763890
support.industry.siemens.com/cs/ww/en/view/109763890
support.industry.siemens.com/cs/ww/en/view/109763891
support.industry.siemens.com/cs/ww/en/view/109767382
support.industry.siemens.com/cs/ww/en/view/109768501
support.industry.siemens.com/cs/ww/en/view/109768507
support.industry.siemens.com/cs/ww/en/view/109776939
support.industry.siemens.com/cs/ww/en/view/109807351/
support.industry.siemens.com/cs/ww/en/view/109812231/
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20Industrial%20Products%20with%20OPC%20UA%20%28Update%20H%29+https://www.cisa.gov/news-events/ics-advisories/icsa-19-099-03
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
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www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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www.winccoa.com/news/detail/new-patch-p018-available-for-315.html
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
58.8%