What is CVE-2021-31630?

CVE-2021-31630 is a high-severity vulnerability in Openplcproject Openplc V3, classified under Code Injection. CVSS score: 8.8/10. Published 2021-08-03.

How severe is CVE-2021-31630?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2021-31630 known to be exploited?

25 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Openplcproject Openplc V3

CVE-2021-31630

Command Injection in Open PLC Webserver v3 allows remote attackers to execute arbitrary code via the "Hardware Layer Code Box" component on the "/hardware" page of the application.

Vulnerability class: RCE (Remote Code Execution)

Published 2021-08-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.271 (98.0th percentile), scored 2026-10-20.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.271 · newest: 0.271 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-94 — Code Injection

Public proof-of-concept exploits

References

www.youtube.com/watch (Exploit, Third Party Advisory)
packetstormsecurity.com/files/162563/OpenPLC-WebServer-3-Remote-Code-Execution… (Exploit, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-31630?: CVE-2021-31630 is a high-severity vulnerability in Openplcproject Openplc V3, classified under Code Injection. CVSS score: 8.8/10. Published 2021-08-03.
How severe is CVE-2021-31630?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2021-31630 known to be exploited?: 25 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.