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PatchSiren cyber security CVE debrief

CVE-2019-11039 Festo Didactic SE CVE debrief

CVE-2019-11039 is a critical PHP flaw in iconv_mime_decode_headers() that can trigger an out-of-buffer read when parsing MIME headers. The result can be information disclosure or a crash. In the supplied CISA advisory corpus, the issue is associated with Festo Didactic SE MES PC deployments, with remediation centered on replacing XAMPP-based software with Festo’s Factory Control Panel.

Vendor
Festo Didactic SE
Product
MES PC
CVSS
CRITICAL 9.1
CISA KEV
Not listed in stored evidence
Original CVE published
2024-02-27
Original CVE updated
2026-01-27
Advisory published
2024-02-27
Advisory updated
2026-01-27

Who should care

Festo Didactic SE MES PC operators, OT and plant IT administrators, engineering workstation owners, and security teams responsible for PHP/XAMPP-based components in industrial environments.

Technical summary

The vulnerability is an integer-overflow issue in PHP’s iconv_mime_decode_headers() MIME header parsing path. Affected versions are PHP 7.1.x below 7.1.30, 7.2.x below 7.2.19, and 7.3.x below 7.3.6. Because the parser may read beyond buffer boundaries, exposure can lead to unintended data disclosure or process termination. The supplied Festo advisory ties the issue to MES PC systems and states that Factory Control Panel is a replacement for XAMPP on those systems and includes fixes for these vulnerabilities.

Defensive priority

Immediate

Recommended defensive actions

  • Inventory MES PC installations and identify any systems using affected PHP/XAMPP components.
  • Verify PHP version levels against the affected ranges: 7.1.x < 7.1.30, 7.2.x < 7.2.19, and 7.3.x < 7.3.6.
  • Obtain the current Factory Control Panel version from Festo technical support at [email protected], as referenced in the advisory.
  • Plan and test the vendor replacement in a staging or maintenance window before rollout to production MES PCs.
  • Treat unexpected crashes or abnormal behavior in the affected parsing path as a priority for investigation and remediation.
  • Apply CISA ICS recommended practices for defense in depth and limit unnecessary access to OT workstations and management hosts.

Evidence notes

The supplied source item is the CISA CSAF advisory ICSA-26-027-02 for Festo Didactic SE MES PC, which references CVE-2019-11039 and states the PHP version ranges and impact. It also lists the vendor remediation: Factory Control Panel as a replacement for XAMPP on MES PCs, with fixes available through Festo technical support. The corpus shows advisory publication on 2024-02-27 and a CISA republication on 2026-01-27; those are source-record dates, not the original flaw origin date.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-11039 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-11039

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

  • CVE-2019-11039 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-11039

    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-26-027-02.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://festo.csaf-tp.certvde.com/.well-known/csaf/white/2024/fsa-202402.json

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://certvde.com/en/advisories/vendor/festo/

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://festo.com/psirt

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://certvde.com/en/advisories/VDE-2023-065

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-027-02

    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

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.