medium Known exploitedREV. 01
CVE-2021-26829OpenPLC ScadaBR — stored script injection in system settings
OpenPLC ScadaBR through 0.9.1 on Linux and 1.12.4 on Windows stores script from the system settings page and runs it in the next operator's session. Hacktivist crews have used it against operational sites.
Read the risk
THE VITAL STATS- CVSS score
- 5.4/ 10 CVSS v3.1
- EPSS probability
- 48% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2021-06-11
- Added to KEV
- 2025-11-28
- Exploit published
- Yes
- Confidence
- high
- Kill chain
- execution
- MITRE ATT&CK
- T1059.007
- Severity
- medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attacker needsThe ability to store content on the settings page, and an operator who later opens it.
Behind the card
5 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisoryforum.scadabr.com.brforum.scadabr.com.br
- 04Exploityoutu.beyoutu.be
- 05Writeupforescout.comforescout.com
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-24 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.