AVEVA PI Connector for CygNet

Posted on Thursday June 12, 2025

1. EXECUTIVE SUMMARY

CVSS v4 6.9
ATTENTION: Low attack complexity
Vendor: AVEVA
Equipment: PI Connector for CygNet
Vulnerabilities: Cross-site Scripting, Improper Validation of Integrity Check Value

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to persist arbitrary code in the administrative portal of the product or cause a denial-of-service condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of PI Connector for CygNet are affected:

PI Connector for CygNet: Version 1.6.14 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE-79

A cross-site scripting vulnerability exists in PI Connector for CygNet Versions 1.6.14 and prior that, if exploited, could allow an administrator miscreant with local access to the connector admin portal to persist arbitrary JavaScript code that will be executed by other users who visit affected pages.

CVE-2025-4417 has been assigned to this vulnerability. A CVSS v3.1 base score of 5.5 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:H/UI:R/S:C/C:N/I:H/A:N).

A CVSS v4 score has also been calculated for CVE-2025-4417. A base score of 6.9 has been calculated; the CVSS vector string is (AV:L/AC:L/AT:N/PR:H/UI:P/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N).

3.2.2 Improper Validation of Integrity Check Value CWE-354

An improper validation of integrity check value vulnerability exists in PI Connector for CygNet Versions 1.6.14 and prior that, if exploited, could allow a miscreant with elevated privileges to modify PI Connector for CygNet local data files (cache and buffers) in a way that causes the connector service to become unresponsive.

CVE-2025-4418 has been assigned to this vulnerability. A CVSS v3.1 base score of 4.4 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

A CVSS v4 score has also been calculated for CVE-2025-4418. A base score of 6.7 has been calculated; the CVSS vector string is (AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: United Kingdom

3.4 RESEARCHER

AVEVA Ethical Disclosure reported these vulnerabilities to CISA.

4. MITIGATIONS

AVEVA recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation. Users of affected product versions should apply security updates to mitigate the risk of exploit.

All affected versions of PI Connector for CygNet can be fixed by upgrading to PI Connector for CygNet v1.7.0 or higher. From OSISoft Customer Portal, search for "PI Connector for CygNet" and select Version 1.7.0 or higher.

AVEVA further recommends users follow general defensive measures:

Ensure that PI Connector for CygNet administrative access is only provided to trusted entities.
Audit custom installation folder Access Control Lists (ACLs) to ensure access is only provided to trusted entities.
Audit and limit membership to the OS Local "Administrators" and "PI Connector Administrators" groups.

For additional information please refer to AVEVA-2025-002.

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:

Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.

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/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing suspected malicious activity should follow established internal procedures and report 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:

Do not click web links or open attachments in unsolicited email messages.
Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time. These vulnerabilities are not exploitable remotely.