CVE-2026-6899
Medium
Description
Check for certificate revocation only considers the first matching CRL and ignores other valid CRLs of the same CA in the CycloneCrypto cryptographic wrapper of S2OPC library. It might allow connection between an OPC UA client and server using a revoked certificate.
SeverityMedium
CVSS5.6
Exploit probability—
ProductS2OPC
PublishedJun 9, 2026
First seenJun 9, 2026
Weakness typeCWE-299CWE-299
How to fix
Update
- Systerel S2OPC1.7.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Systerel S2OPC | 1.5.0 ≤ v < 1.7.3 | 1.7.3 |
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