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PatchSiren cyber security CVE debrief

CVE-2025-47219 Siemens CVE debrief

CVE-2025-47219 is a memory-safety issue described in the source corpus as a heap buffer read past the end while GStreamer’s isomp4 plugin parses an MP4 file. The advisory metadata also maps it to Siemens SIMATIC CN 4100 with low confidence, so product applicability should be confirmed before acting on the remediation.

Vendor
Siemens
Product
SIMATIC CN 4100
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-12
Original CVE updated
2026-05-14
Advisory published
2026-05-12
Advisory updated
2026-05-14

Who should care

Security teams and operators that process external MP4 content with GStreamer, and Siemens SIMATIC CN 4100 owners if the CISA/Siemens product mapping applies. ICS defenders should review it because the source advisory was published through CISA.

Technical summary

The source description says GStreamer through 1.26.1 may read past the end of a heap buffer in qtdemux_parse_trak while handling MP4 parsing, which can lead to information disclosure. CISA assigns CVSS 3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H (8.1), indicating a high-severity issue even though exploitation complexity is not low. The supplied corpus also contains a product mapping to Siemens SIMATIC CN 4100 vers:intdot/<5.0, but that mapping is marked low confidence and needs review.

Defensive priority

High — prioritize validation of exposure, especially any service that parses externally supplied MP4 files, and confirm the affected product mapping before scheduling remediation.

Recommended defensive actions

  • Confirm whether your environment actually uses the affected GStreamer isomp4/qtdemux code path or the Siemens SIMATIC CN 4100 product mapping in the advisory.
  • Apply the vendor remediation listed in the advisory: update to V5.0 or later for the affected Siemens product set, if applicable.
  • Reduce exposure for untrusted media ingestion paths and review where MP4 files are accepted from external or semi-trusted sources.
  • Use CISA ICS recommended practices and defense-in-depth guidance for systems in scope of the advisory.

Evidence notes

The supplied corpus is internally inconsistent: the vulnerability description is for GStreamer through 1.26.1, while the metadata/product fields point to Siemens SIMATIC CN 4100 vers:intdot/<5.0 with low confidence and a needs-review flag. The source item identifies CISA advisory ICSA-26-134-10, published 2026-05-12 and republished 2026-05-14 as an initial republication of Siemens ProductCERT SSA-032379. No KEV entry or ransomware-campaign attribution was provided in the corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-47219 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-47219

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

  • CVE-2025-47219 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-47219

    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/2026/icsa-26-134-10.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/csaf/ssa-032379.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://cert-portal.siemens.com/productcert/html/ssa-032379.html

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-134-10

    Reference

  • Source reference

    Unverified legacy reference

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

    Reference

  • Source reference

    Unverified legacy reference

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

    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.