What’s Vulnerable › Vulnerabilities

CVE-2025-34226: OpenPLC Runtime v3 Persistent DoS

• Severity: high (CVSS 7.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-03 · updated 2026-10-08
• Weakness: CWE-20

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 095ee09.

References

• https://autonomylogic.com/
• https://github.com/thiagoralves/OpenPLC_v3/pull/297/commits/095ee09623dd229b64ad3a1db38a901a3772f6fc
• https://openplc.discussion.community/post/persistant-dos-affecting-openplc-runtime-13722844
• https://www.vulncheck.com/advisories/openplc-runtime-v3-persistent-denial-of-service
• https://openplc.discussion.community/post/persistant-dos-affecting-openplc-runtime-13722844

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