PatchSiren cyber security CVE debrief

CVE-2020-7064 Festo Didactic SE CVE debrief

This advisory covers a low-complexity PHP EXIF parsing bug that can read one byte of uninitialized memory when exif_read_data() processes malicious data. For Festo Didactic SE MES PC environments, the practical concern is exposure through the affected PHP stack, with potential for limited information disclosure or a crash. The vendor-referenced remediation path is to move to the fixed Factory Control Panel release available through Festo support.

Vendor: Festo Didactic SE
Product: MES PC
CVSS: MEDIUM 5.4
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 MES PC operators, OT/ICS administrators, and anyone responsible for PHP applications that parse untrusted images with exif_read_data(). Security teams should prioritize systems still running PHP 7.2.x below 7.2.9, 7.3.x below 7.3.16, or 7.4.x below 7.4.4.

Technical summary

The underlying flaw is a one-byte uninitialized memory read in PHP's EXIF parser. Malicious EXIF content can cause PHP to disclose a small amount of memory or terminate unexpectedly. The supplied advisory associates the issue with Festo Didactic SE MES PC and points to a replacement Factory Control Panel release as the remediation path.

Defensive priority

Medium

Recommended defensive actions

Update affected PHP to the fixed releases referenced in the advisory: 7.2.9+, 7.3.16+, or 7.4.4+ where applicable.
If you operate Festo Didactic MES PC, obtain and deploy the current Factory Control Panel release through Festo technical support.
Inventory MES PC systems for bundled PHP/XAMPP or other EXIF-parsing components that may still be exposed.
Limit ingestion of untrusted image content where feasible and validate inputs before EXIF parsing.
Monitor for PHP crashes or anomalous behavior that could indicate the flaw is being triggered.

Evidence notes

The source item is a CISA CSAF republication of Festo Didactic SE advisory ICSA-26-027-02 for MES PC. The description matches the PHP issue: exif_read_data() can read one byte of uninitialized memory in PHP 7.2.x below 7.2.9, 7.3.x below 7.3.16, and 7.4.x below 7.4.4. The remediation notes state that Factory Control Panel replaces XAMPP on MES PCs and is available from Festo technical support. No KEV entry is present in the supplied corpus.

Official resources

Publicly disclosed through vendor and CISA advisory channels; the supplied source item shows initial publication on 2024-02-27 and a later CISA republication on 2026-01-27.