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CVE-2026-6899

Improper Check for Certificate Revocation in S2OPC

MEDIUM
5.6
CVSS Score
Published: June 9, 2026 at 08:39 AM UTC
Updated: July 23, 2026 at 07:32 PM UTC
1 product affected across 1 vendorS2OPC

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Severity
MEDIUM5.6
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

S2OPC· Systerel
60%
1.5.0 ≤ v < 1.7.31.5.0
Affected range stops below 1.7.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.6MEDIUMGitLab
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-299

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