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PatchSiren cyber security CVE debrief

CVE-2025-30421 National Instruments CVE debrief

CVE-2025-30421 is a high-severity stack-based buffer overflow in National Instruments Circuit Design Suite. According to the CISA CSAF advisory, improper input validation can allow arbitrary code execution if an attacker convinces a user to open a specially crafted SYM file. National Instruments says the issue is addressed in version 14.3.1 or later.

Vendor
National Instruments
Product
Circuit Design Suite
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2025-05-20
Original CVE updated
2025-05-20
Advisory published
2025-05-20
Advisory updated
2025-05-20

Who should care

Organizations using National Instruments Circuit Design Suite, especially teams that exchange, review, or open SYM files, and security/IT staff responsible for engineering or ICS-adjacent workstation patching.

Technical summary

The advisory describes a stack-based buffer overflow caused by improper input validation in Circuit Design Suite. The supplied CVSS v3.1 vector is AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, scored 7.8 (High). The practical trigger is user interaction: an attacker must get a user to open a specially crafted SYM file. The affected product scope in the CSAF data is National Instruments Circuit Design Suite version 14.3.0 and earlier.

Defensive priority

High — prioritize remediation on any system running an affected version, because the issue can lead to arbitrary code execution and requires only user interaction to trigger.

Recommended defensive actions

  • Update National Instruments Circuit Design Suite to version 14.3.1 or later, as recommended by the vendor.
  • Inventory installations to find any deployment of Circuit Design Suite version 14.3.0 or earlier.
  • Treat SYM files from unverified or unexpected sources as suspicious and review file-handling workflows accordingly.
  • Apply general industrial control system hardening and defense-in-depth guidance from the CISA resources linked in the advisory.
  • Validate remediation after patching and confirm affected users are on the fixed release.

Evidence notes

All core facts in this debrief are taken from the supplied CISA CSAF advisory ICSA-25-140-02 and the linked National Instruments security update. The source states the vulnerability type (stack-based buffer overflow), cause (improper input validation), trigger condition (user opens a specially crafted SYM file), affected product/version range (National Instruments Circuit Design Suite <=14.3.0), and remediation (14.3.1 or later). The supplied CVE and source timestamps are both 2025-05-20T06:00:00Z. No KEV listing or ransomware-campaign linkage is present in the supplied enrichment.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-30421 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-30421

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-30421 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-30421

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2025/icsa-25-140-02.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-25-140-02

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.