PatchSiren cyber security CVE debrief

CVE-2022-4048 CODESYS CVE debrief

CVE-2022-4048 is a high-severity local attack against CODESYS Development System V3 versions prior to 3.5.18.40. In affected Festo Automation Suite deployments that bundled vulnerable CODESYS components, an unauthenticated local attacker could access and manipulate encrypted boot application code.

Vendor: CODESYS
Product: FESTO
CVSS: HIGH 7.7
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-02-26
Original CVE updated: 2026-03-17
Advisory published: 2026-02-26
Advisory updated: 2026-03-17

Who should care

OT/ICS teams, Festo Automation Suite users, CODESYS integrators, and administrators of engineering workstations or hosts where local access is possible.

Technical summary

The advisory describes inadequate encryption strength in CODESYS Development System V3 prior to 3.5.18.40. The CVSS 3.1 vector is AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N, indicating local exploitation with no privileges or user interaction, and strong confidentiality and integrity impact. CISA’s source item ties the issue to Festo Automation Suite deployments and states that, starting with Festo Automation Suite 2.8.0.138, CODESYS is no longer bundled and must be obtained separately from the official CODESYS website.

Defensive priority

High for OT environments with local engineering-workstation access.

Recommended defensive actions

Inventory Festo Automation Suite installations and verify whether any deployment includes CODESYS Development System versions prior to 3.5.18.40.
Upgrade CODESYS to the latest patched version from the official CODESYS website.
Update Festo Automation Suite to version 2.8.0.138 or later, and keep the Festo Automation Suite connector current.
Limit and monitor local access to engineering workstations and systems that can modify boot application code.
Track vendor advisories from CODESYS, Festo, CertVDE, and CISA for follow-on updates or clarified affected versions.

Evidence notes

This debrief is based on the supplied CISA CSAF source item (ICSA-26-076-01) and the linked official references. The vulnerable component is explicitly named as CODESYS Development System V3 prior to 3.5.18.40. The supplied vendor metadata is low-confidence and should be treated as needing review because the advisory content centers on Festo Automation Suite bundling CODESYS components rather than a standalone FESTO product claim.

Sources and references

Verified primary and authoritative sources

CVE-2022-4048 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2022-4048

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2022-4048 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2022-4048

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-26-076-01.json

cisa_csaf
Source reference
Unverified legacy reference

URL: https://festo.csaf-tp.certvde.com/.well-known/csaf/white/2026/fsa-202601.json

Reference
Source reference
Unverified legacy reference

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

Reference
Source reference
Unverified legacy reference

URL: https://www.festo.com/psirt

Reference
Source reference
Unverified legacy reference

URL: https://certvde.com/en/advisories/VDE-2025-108

Reference
Source reference
Unverified legacy reference

URL: https://www.cve.org/CVERecord?id=CVE-2025-2595

Reference
Source reference
Unverified legacy reference

URL: https://www.cisa.gov/news-events/ics-advisories/icsa-26-076-01

Reference
Source reference
Unverified legacy reference

URL: https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01

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.