CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:M/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
41.4%
This advisory update is a follow-up to the original advisory titled ICSA-22-041-01 Siemens Industrial Products (Update A) that was published February 10, 2022, to the ICS webpage on us-cert.cisa.gov.
Successful exploitation of these vulnerabilities could allow an unauthenticated attacker to cause a denial-of-service condition.
The following versions of Siemens Industrial Products with SIMATIC Firmware, a software platform, are affected:
------- Begin Update B Part 1 of 3 -------
------- End Update B Part 1 of 3 -------
An unauthenticated attacker could cause a denial-of-service condition in a PLC when sending specially prepared packets over Port 102/TCP. A restart of the affected device is needed to restore normal operations.
CVE-2021-37185 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
An unauthenticated attacker could cause a denial-of-service condition in a PLC when sending specially prepared packets over Port 102/TCP. A restart of the affected device is needed to restore normal operations.
CVE-2021-37204 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
An unauthenticated attacker could cause a denial-of-service condition in a PLC when sending specially prepared packets over Port 102/TCP. A restart of the affected device is needed to restore normal operations.
CVE-2021-37205 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Gao Jian assisted the coordinated disclosure of these vulnerabilities with Siemens.
Siemens is preparing updates and recommends specific countermeasures for products where updates are not, or not yet available:
------- Begin Update B Part 2 of 3 -------
------- End Update B Part 2 of 3 -------
------- Begin Update B Part 3 of 3 -------
------- End Update B Part 3 of 3 -------
As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemensβ operational guidelines for industrial security, and following 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 see Siemens Security Advisory SSA-838121
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 these vulnerabilities.
cert-portal.siemens.com/operational-guidelines-industrial-security.pdf
cert-portal.siemens.com/productcert/pdf/ssa-838121.pdf
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-22-041-01
cwe.mitre.org/data/definitions/401.html
cwe.mitre.org/data/definitions/672.html
cwe.mitre.org/data/definitions/672.html
new.siemens.com/global/en/products/services/cert.html#SecurityPublications
nvd.nist.gov/vuln/detail/CVE-2021-37185
nvd.nist.gov/vuln/detail/CVE-2021-37204
nvd.nist.gov/vuln/detail/CVE-2021-37205
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/109759122/
support.industry.siemens.com/cs/ww/en/view/109773914/
support.industry.siemens.com/cs/ww/en/view/109793280/
support.industry.siemens.com/cs/ww/en/view/109805271/
twitter.com/CISAgov
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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
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:M/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
41.4%