IEC 62443 security levels defined by attacker capability (SL1-SL4, IEC 62443-3-3)
SL1-SL4observed
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| As of | 2025 |
| Source | IEC 62443-3-3:2013 (SL definitions); ISA InTech 2016 summary · Section “Security level”: definitions of SL1 through SL4 by attacker means, resources, skills, and motivation |
| Review | checking…review by 2027-02-02 · slow cadence |
| Recorded changes | last 2026-10-16 · 2 revisions tracked |
| Claim id | iec-62443-security-levels-by-attacker |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.