NSA GRASSMARLIN

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Summary
Successful exploitation of this vulnerability could allow an attacker to disclose sensitive information.
The following versions of NSA GRASSMARLIN are affected:

GRASSMARLIN vers:all/*





CVSS
Vendor
Equipment
Vulnerabilities




v3 5.5
NSA
NSA GRASSMARLIN
Improper Restriction of XML External Entity Reference




Background

Critical Infrastructure Sectors: Information Technology
Countries/Areas Deployed: Worldwide
Company Headquarters Location: United States


Vulnerabilities

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CVE-2026-6807

A vulnerability in GRASSMARLIN v3.2.1 allows crafted session data to trigger improper handling of XML input, which may result in unintended exposure of sensitive information. The flaw stems from insufficient hardening of the XML parsing process.
View CVE Details

Affected Products
NSA GRASSMARLIN

Vendor:NSA
Product Version:NSA GRASSMARLIN: vers:all/*
Product Status:known_affected


Remediations
Vendor fixNSA has indicated that the GRASSMARLIN project has reached end-of-life status as of 2017 and is no longer supported. The project is archived, and no patches or further updates are planned or expected.

Relevant CWE: CWE-611 Improper Restriction of XML External Entity Reference

Metrics




CVSS Version
Base Score
Base Severity
Vector String




3.1
5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N








Acknowledgments

Grady DeRosa reported this vulnerability to CISA


Legal Notice and Terms of Use
This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).

Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability.
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 this vulnerability has been reported to CISA at this time.

Revision History

Initial Release Date: 2026-04-28




Date
Revision
Summary




2026-04-28
1
Initial Publication




Legal Notice and Terms of Use

https://www.cisa.gov/news-events/ics-advisories/icsa-26-118-01

2026-04-28 12:00 UTC
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