CVE-2026-6899

Improper Check for Certificate Revocation in S2OPC

State: Published
Severity: 5.6 Medium
Published: Jun 9, 2026
Updated: Jun 9, 2026
Reserved: Apr 23, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.6 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L	GitLab

Weaknesses

CWE-299 Improper Check for Certificate Revocation

Affected Products

Product	Versions
S2OPCSysterel	1.5.0 to before 1.7.3Affected

References

https://gitlab.com/systerel/S2OPC/-/work_items/1739

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