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CVE-2026-6899— Improper Check for Certificate Revocation in S2OPC

Quick assessment

Affected
Systerel S2OPC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

S2OPC OPC UA Toolkit是Systerel开源的一个OPC UA通信开发工具包。 S2OPC OPC UA Toolkit存在安全漏洞，该漏洞源于CycloneCrypto加密包装器中证书吊销检查仅考虑第一个匹配CRL而忽略同一CA的其他有效CRL，可能导致OPC UA客户端和服务器使用吊销证书建立连接。

CVSS 5.6 · Medium EPSS 0.11% · P1

Affected Version Matrix 1

VendorProduct Version RangeStatus
Systerel S2OPC 1.5.0< 1.7.3 affected
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I. Basic Information for CVE-2026-6899

Vulnerability Information
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Vulnerability Title
Improper Check for Certificate Revocation in S2OPC
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
证书撤销验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
S2OPC OPC UA Toolkit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
S2OPC OPC UA Toolkit是Systerel开源的一个OPC UA通信开发工具包。 S2OPC OPC UA Toolkit存在安全漏洞，该漏洞源于CycloneCrypto加密包装器中证书吊销检查仅考虑第一个匹配CRL而忽略同一CA的其他有效CRL，可能导致OPC UA客户端和服务器使用吊销证书建立连接。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Systerel S2OPC 1.5.0 ~ 1.7.3 -

II. Public POCs for CVE-2026-6899

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III. Intelligence Information for CVE-2026-6899

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Patches & Fixes for CVE-2026-6899 (1)

IV. Related Vulnerabilities

Same product: S2OPC
Same vendor: Systerel
Same weakness: CWE-299