ICSA-25-205-03

Vulnerability from csaf_cisa - Published: 2025-07-24 06:00 - Updated: 2025-08-04 06:00
Summary
Honeywell Experion PKS (Update A)
Notes
Legal Notice: All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.
Risk evaluation: Successful exploitation of these vulnerabilities could result in information exposure, denial of service, or remote code execution.
Critical infrastructure sectors: Chemical, Critical Manufacturing, Energy, Healthcare and Public Health, Water and Wastewater Systems
Countries/areas deployed: Worldwide
Company headquarters location: United States
Recommended Practices: CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:
Recommended Practices: Ensure the least-privilege user principle is followed.
Recommended Practices: Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the Internet.
Recommended Practices: Locate control system networks and remote devices behind firewalls and isolating them from business networks.
Recommended Practices: 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.
Recommended Practices: CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
Recommended Practices: 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.
Recommended Practices: CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Recommended Practices: 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.
Recommended Practices: Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
Recommended Practices: No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.
CVE-2025-2520
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-457 - Use of Uninitialized Variable
Affected products
Product Identifier Version Remediation
Honeywell Experion PKS: <R520.2_TCU9_Hot_Fix_1
Honeywell / Experion PKS
 <R520.2_TCU9_Hot_Fix_1
Vendor Fix fix
Honeywell Experion PKS: <R530_TCU3_Hot_Fix_1
Honeywell / Experion PKS
 <R530_TCU3_Hot_Fix_1
Vendor Fix fix
CVE-2025-2521
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected products
Known affected 2 products, the same list as for CVE-2025-2520
CVE-2025-2522
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE-226 - Sensitive Information in Resource Not Removed Before Reuse
Affected products
Known affected 2 products, the same list as for CVE-2025-2520
CVE-2025-2523
9.4 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
CWE-191 - Integer Underflow (Wrap or Wraparound)
Affected products
Known affected 2 products, the same list as for CVE-2025-2520
CVE-2025-3946
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CWE-430 - Deployment of Wrong Handler
Affected products
Known affected 2 products, the same list as for CVE-2025-2520
CVE-2025-3947
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CWE-191 - Integer Underflow (Wrap or Wraparound)
Affected products
Known affected 2 products, the same list as for CVE-2025-2520
References
Acknowledgments
Positive Technologies Demid Uzenkov Kirill Kutaev
To clipboard 

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        "title": "Recommended Practices"
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        "title": "Recommended Practices"
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        "title": "Recommended Practices"
      },
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    "title": "Honeywell Experion PKS (Update A)",
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        "name": "Use of Uninitialized Variable"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The Honeywell Experion PKS contains an uninitialized variable in the common Epic Platform Analyzer (EPA) communications. An attacker could potentially exploit this vulnerability, leading to communication channel manipulation, which results in a dereferencing of an uninitialized pointer leading to a denial of service.",
          "title": "Vulnerability Summary"
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        "name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The Honeywell Experion PKS contains a memory buffer vulnerability in the component Control Data Access (CDA). An attacker could potentially exploit this vulnerability, leading to overread buffers, which could result in improper index validation against buffer borders, leading to remote code execution.",
          "title": "Vulnerability Summary"
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      ],
      "remediations": [
        {
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          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002"
          ],
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        "id": "CWE-226",
        "name": "Sensitive Information in Resource Not Removed Before Reuse"
      },
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        {
          "category": "summary",
          "text": "The Honeywell Experion PKS contains sensitive information in resource vulnerability in the component Control Data Access (CDA). An attacker could potentially exploit this vulnerability, leading to communication channel manipulation, which could result in buffer reuse, which may cause incorrect system behavior.",
          "title": "Vulnerability Summary"
        }
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          "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "remediations": [
        {
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          "details": "Honeywell recommends updating Experion PKS R520.2 TCU9 Hot Fix 1 or R530 TCU3 Hot Fix 1. For more information, see the Security Notice.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002"
          ],
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        }
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        {
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            "CSAFPID-0001",
            "CSAFPID-0002"
          ]
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    {
      "cve": "CVE-2025-2523",
      "cwe": {
        "id": "CWE-191",
        "name": "Integer Underflow (Wrap or Wraparound)"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The Honeywell Experion PKS contains an integer underflow vulnerability in the component Control Data Access (CDA). An attacker could potentially exploit this vulnerability, leading to communication channel manipulation, which could result in a failure during subtraction, allowing remote code execution.",
          "title": "Vulnerability Summary"
        }
      ],
      "product_status": {
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          "CSAFPID-0001",
          "CSAFPID-0002"
        ]
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          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-2523"
        },
        {
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          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Honeywell recommends updating Experion PKS R520.2 TCU9 Hot Fix 1 or R530 TCU3 Hot Fix 1. For more information, see the Security Notice.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002"
          ],
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        }
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      "scores": [
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          "cvss_v3": {
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H",
            "version": "3.1"
          },
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            "CSAFPID-0002"
          ]
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      ]
    },
    {
      "cve": "CVE-2025-3946",
      "cwe": {
        "id": "CWE-430",
        "name": "Deployment of Wrong Handler"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The Honeywell Experion PKS contains a deployment of wrong handler vulnerability in the component Control Data Access (CDA). An attacker could potentially exploit this vulnerability, leading to input data manipulation, which could result in incorrect handling of packets, leading to remote code execution.",
          "title": "Vulnerability Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001",
          "CSAFPID-0002"
        ]
      },
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          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-3946"
        },
        {
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          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Honeywell recommends updating Experion PKS R520.2 TCU9 Hot Fix 1 or R530 TCU3 Hot Fix 1. For more information, see the Security Notice.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002"
          ],
          "url": "https://process.honeywell.com/us/en/support/technical-publication?search=SN2025"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001",
            "CSAFPID-0002"
          ]
        }
      ]
    },
    {
      "cve": "CVE-2025-3947",
      "cwe": {
        "id": "CWE-191",
        "name": "Integer Underflow (Wrap or Wraparound)"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The Honeywell Experion PKS contains an integer underflow vulnerability in the component Control Data Access (CDA). An attacker could potentially exploit this vulnerability, leading to input data manipulation, which could result in improper integer data value checking during subtraction, leading to a denial of service.",
          "title": "Vulnerability Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001",
          "CSAFPID-0002"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-3947"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Honeywell recommends updating Experion PKS R520.2 TCU9 Hot Fix 1 or R530 TCU3 Hot Fix 1. For more information, see the Security Notice.",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002"
          ],
          "url": "https://process.honeywell.com/us/en/support/technical-publication?search=SN2025"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001",
            "CSAFPID-0002"
          ]
        }
      ]
    }
  ]
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.