5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
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
7.8 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
40.5%
This updated advisory is a follow-up to the original advisory titled ICSA-20-308-01 WAGO Series 750-88x and 750-352 that was published November 3, 2020, to the ICS webpage on us-cert.gov.
Successful exploitation of this vulnerability could allow an attacker to crash the device being accessed using a denial-of-service attack.
The firmware versions prior to FW11 of the following WAGO Series products are affected:
--------- Begin Update A Part 1 of 1 ---------
--------- End Update A Part 1 of 1 ---------
An attacker can execute a denial-of-service attack by sending a series of maliciously constructed packets to HTTP(S) Ports 80/443, which may cause the device to crash.
CVE-2020-12516 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).
William Knowles (Applied Risk) of CERT@VDE reported this vulnerability to WAGO.
WAGO recommends updating to the latest firmware, Version FW14
Other mitigations and workarounds are available to help reduce the risk:
CERT@VDE has published an advisory regarding this vulnerability.
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 us-cert.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 us-cert.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 this vulnerability.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12516
cert.vde.com/en-us/advisories/vde-2020-042
cwe.mitre.org/data/definitions/400.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=WAGO%20Series%20750-88x%20and%20750-352%20%28Update%20A%29+https://www.cisa.gov/news-events/ics-advisories/icsa-20-308-01
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics
us-cert.cisa.gov/ics/recommended-practices
us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B
us-cert.cisa.gov/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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www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-20-308-01
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www.usa.gov/
www.wago.com/us/requestDownload?downloadFile=FWMedia_58_750-881
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=WAGO%20Series%20750-88x%20and%20750-352%20%28Update%20A%29&body=www.cisa.gov/news-events/ics-advisories/icsa-20-308-01
5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
7.5 High
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
7.8 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
40.5%