CVE-2025-34226

OpenPLC Runtime v3 Persistent DoS

HIGH
7.1
CVSS Score
Published: October 3, 2025 at 03:36 PM UTC
Updated: October 8, 2026 at 10:10 PM UTC
2 products affected across 2 vendorsOpenPLC_v3OpenPLC Runtime

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Severity
HIGH7.1
Exploit prediction
EPSS 0.7%
SSVC
PoC

Description

OpenPLC Runtime v3 contains an input validation flaw in the /upload-program-action endpoint: the epoch_time field supplied during program uploads is not validated and can be crafted to induce corruption of the programs database. After a successful malformed upload the runtime continues to operate until a restart; on restart the runtime can fail to start because of corrupted database entries, resulting in persistent denial of service requiring complete rebase of the product to recover. This vulnerability was remediated by commit 095ee09623dd229b64ad3a1db38a901a3772f6fc.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

3.0 ≤ v < 095ee09623dd229b64ad3a1db38a901a3772f6fc3.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHVulnCheck
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-664CWE-20

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