CVE-2021-31630

highpriority · attend · 54EPSS 0.271 · 98 %ileexploit · PoCEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

12 exploits · PoC

Likely / severe?

27.1% (98th) EPSS

CVSS 9 · high

Is it mine?

2 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-29

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.

cvss

Technical severity, 0–10. One row per scoring source.

9.0

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.09highAV:N/AC:L/Au:S/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 8 · impact 10

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.18.3highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-94USprimary

exploits (12)

Public proof-of-concept and weaponised exploit code.

FlojBoj/CVE-2021-31630POC Exploit for CVE-2021-31630 written in Python3 and using C reverse shell with non-blocking modePoC · poc_in_github
Hunt3r0x/CVE-2021-31630-HTBproof of Concept (PoC) exploit for CVE-2021-31630, targeting the OpenPLC service running on the WifineticTwo box on the Hack The Box platform.PoC · poc_in_github
UserB1ank/CVE-2021-31630UserB1ank/CVE-2021-31630PoC · poc_in_github
adibna/cve-2021-31630This is a automation of cve-2021-31630 exploitationPoC · poc_in_github
behindsecurity/htb-wifinetictwo-exploitA simple python script to exploit CVE-2021-31630 on HTB WifineticTwo CTFPoC · poc_in_github
hev0x/CVE-2021-31630-OpenPLC_RCEExploit for Authenticated Remote Code Execution on OpenPLC v3 WebserverPoC · poc_in_github

affected products (2)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
openplcproject openplc v3 firmwareall versionsnvdUScpe:2.3:o:openplcproject:openplc_v3_firmware:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-08-03modified 2026-06-17

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+10471 more

references (6)

External citations — patches, advisories, analysis.

scry

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