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Public proof of concept

CVE-2021-31630

A public proof of concept exists; no exploitation attested.

  • Published2021-08-03
  • WeaknessCWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-08-0315:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-31630?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-31630?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Openplcproject openplc v3 firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
12 repositories, unverifiedhev0x/CVE-2021-31630-OpenPLC_RCEHunt3r0x/CVE-2021-31630-HTBthewhiteh4t/cve-2021-31630behindsecurity/htb-wifinetictwo-exploitmind2hex/CVE-2021-31630-OpenPLC-3-Authenticated-RCE
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.18.8read 2026-10-23
  • NVDCVSS 2.09read 2026-10-23
  • NVDweakness (CWE)CWE-94read 2026-10-23
  • FIRST EPSSEPSS score27.1 %read 2026-11-03
  • PoC-in-GitHubproof of concept12read 2026-11-03

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2021-08-03
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is 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.

Is CVE-2021-31630 actively exploited?

Active exploitation of CVE-2021-31630 has not been confirmed. Its EPSS score was 27.1% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-31630?

CVE-2021-31630 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record