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
34.6%
Successful exploitation of these vulnerabilities could crash the device being accessed, resulting in a buffer overflow condition that may allow remote code execution.
The following versions of 1794-AENT Flex I/O Series B, an Ethernet/IP adapter, are affected:
A buffer overflow vulnerability exists in the Ethernet/IP Request Path Port Segment. This vulnerability could allow a remote, unauthenticated attacker to send a malicious packet resulting in a denial-of-service condition on the device.
CVE-2020-6083 has been assigned to this vulnerability. A CVSS v3 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).
A buffer overflow vulnerability exists in the Ethernet/IP Request Path Logical Segment. This vulnerability could allow a remote, unauthenticated attacker to send a malicious packet resulting in the device entering a fault state, causing a denial-of-service condition.
CVE-2020-6084 and CVE-2020-6085 have been assigned to this vulnerability. A CVSS v3 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).
A buffer overflow vulnerability exists in the Ethernet/IP Request Path Data Segment. This vulnerability could allow a remote, unauthenticated attacker to send a malicious packet resulting in the device entering a fault state, causing a denial-of-service condition.
CVE-2020-6086 and CVE-2020-6087 has been assigned to this vulnerability. A CVSS v3 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).
Jared Rittle of Cisco Talos reported these vulnerabilities to Rockwell Automation.
Rockwell Automation recommends affected users ensure they are employing proper network segmentation and security controls when implementing the affected product.
For more information please see the Rockwell Automation Security Advisory (login required).
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.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
No known public exploits specifically target these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-6083
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-6084
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-6085
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-6086
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-6087
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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
34.6%