ICS Advisory (ICSA-16-061-02)

Rockwell Automation Allen-Bradley CompactLogix Reflective Cross-Site Scripting Vulnerability (Update A)

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  • CVSS v3 6.1
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  • ATTENTION: Exploitable remotely/low skill level to exploit/public exploits are available
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  • Vendor: Rockwell Automation
  • Equipment: Allen-Bradley CompactLogix
  • Vulnerability: Cross-site Scripting


This updated advisory is a follow-up to the original advisory titled ICSA-16-061-02 Rockwell Automation Allen-Bradley CompactLogix Reflective Cross-Site Scripting Vulnerability that was published March 1, 2016, on the NCCIC/ICS-CERT website. 


Successful exploitation of this vulnerability could allow an attacker to inject arbitrary JavaScript into a user’s web browser.



Rockwell Automation reports the vulnerability affects the following versions of the Allen Bradley CompactLogix controller platform:

  • 1769-L16ER-BB1B, Version 27.011 and prior,
  • 1769-L18ER-BB1B, Version 27.011 and prior,
  • 1769-L18ERM-BB1B, Version 27.011 and prior,
  • 1769-L24ER-QB1B, Version 27.011 and prior,
  • 1769-L24ER-QBFC1B, Version 27.011 and prior,
  • 1769-L27ERM-QBFC1B, Version 27.011 and prior,
  • 1769-L30ER, Version 27.011 and prior,
  • 1769-L30ERM, Version 27.011 and prior,
  • 1769-L30ER-NSE, Version 27.011 and prior,
  • 1769-L33ER, Version 27.011 and prior,
  • 1769-L33ERM, Version 27.011 and prior,
  • 1769-L36ERM, Version 27.011 and prior,
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  • 1769-L23E-QB1B, Version 20.018 and prior (discontinued as of June 2016), 
  • 1769-L23E-QBFC1B, Version 20.018 and prior (discontinued as of June 2016),
  • 1756-EN2F,
    • Series A, all versions,
    • Series B, all versions,
  • 1756-EN2T,
    • Series A, all versions,
    • Series B, all versions,
    • Series C, all versions,
    • Series D, Version 10.007 and prior,
  • 1756-EN2TR,
    • Series A, all versions,
    • Series B, all versions,
  • 1756-EN3TR, and
    • Series A, all versions.
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The vulnerability in the CompactLogix’s web application allows an attacker to inject arbitrary JavaScript into a user’s web browser. The target of this type of attack is not the CompactLogix itself. Instead, the CompactLogix is a vehicle used to deliver an attack to the web browser. 

CVE-2016-2279 has been assigned to this vulnerability. A CVSS v3 base score of 6.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).


  • CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems


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Aditya Sood and Venkatesh Sivakumar (@PranavVenkatS) reported this vulnerability to NCCIC.

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Rockwell Automation recommends that users of 1769-L23E-QB1B migrate to 1769-L24ER-BB1B and users of 1769-L23E-QBFC1B migrate to 1769-L24ER-QBFC1B.

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For 1756-EN2F Series C, 1756-EN2T Series D, 1756-EN2TR Series C, and 1756-EN3TRSeries B, Rockwell Automation recommends users apply FRN 10.010 or later available at:


For earlier versions: users using previous series of the affected 1756 EtherNet/IP catalog numbers are urged to assess their risk and, if necessary, contact their local distributor or sales office in order to upgrade to a newer product line that contains the relevant mitigations.

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For the other affected versions listed above, Rockwell Automation recommends users apply firmware Version 28.011+ available at:


For more detailed information, please see Rockwell Automation’s security notification (KB731098), available at the following URL with a valid account:


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Rockwell Automation also recommends the following security practices:

  • Do not click on or open URL links from untrusted sources.
  • Employ training and awareness programs to educate users on the warning signs of a phishing or social engineering attack.
  • Use trusted software, software patches, antivirus/antimalware programs and interact only with trusted websites and attachments.
  • Employ training and awareness programs to educate users on the warning signs of a phishing or social engineering attack.
  • Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet
  • Locate control system networks and devices behind firewalls, and isolate them from the business network.
  • When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.

NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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-CERT website 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 NCCIC for tracking and correlation against other incidents.

NCCIC also recommends that users take the following measures to protect themselves from social engineering attacks: 

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Contact Information

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  https://us-cert.cisa.gov/ics 
or incident reporting:  https://us-cert.cisa.gov/report

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