CVE-2018-14851 Festo Didactic SE CVE debrief

Who should care

Festo Didactic MES PC operators, OT/ICS administrators, and any team responsible for a deployment that includes the affected PHP EXIF component or vendor-provided image-processing stack. Prioritize systems that may process untrusted JPEG content or where an application crash would disrupt operations.

Technical summary

The core flaw is in PHP's EXIF parser, specifically exif_process_IFD_in_MAKERNOTE in ext/exif/exif.c. According to the advisory text, crafted JPEG input can trigger an out-of-bounds read and application crash. The supplied vulnerable version range is PHP before 5.6.37, 7.0.x before 7.0.31, 7.1.x before 7.1.20, and 7.2.x before 7.2.8. The supplied CVSS 3.0 vector is AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H, indicating an availability-impacting issue with user interaction required under the published scoring.

Defensive priority

Medium. Patch or replace affected components promptly if the MES PC environment still uses the vulnerable PHP EXIF code path, especially where availability matters or JPEG intake cannot be tightly controlled.

Recommended defensive actions

• Verify whether any MES PC deployment includes PHP versions earlier than 5.6.37, 7.0.31, 7.1.20, or 7.2.8, or vendor bundles that embed those components.
• Apply the vendor remediation path in the advisory: obtain the current Factory Control Panel replacement from Festo Didactic support ([email protected]).
• Treat untrusted JPEG handling as an attack surface; restrict where image files can be introduced and processed.
• Add compensating availability controls such as system isolation, crash monitoring, and recovery procedures for MES PC nodes.
• Use the CISA and vendor advisory references to confirm the exact affected deployment model before and after remediation.

Evidence notes

The source corpus ties CVE-2018-14851 to PHP's EXIF parser (exif_process_IFD_in_MAKERNOTE in ext/exif/exif.c) and states that crafted JPEG files can cause an out-of-bounds read and crash. CISA CSAF advisory ICSA-26-027-02 associates the CVE with Festo Didactic SE MES PC and lists a remediation that replaces XAMPP on MES PCs with Factory Control Panel. The advisory source also supplies CVSS 3.0 vector AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. The supplied advisory timestamps are 2024-02-27 for publication and 2026-01-27 for republication; these are source timestamps and not the original vulnerability discovery date.

Official resources