Improper Check for Certificate Revocation Affecting systerel/S2OPC package, versions [,1.7.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published23 Jun 2026
- disclosed9 Jun 2026
- creditUnknown
Introduced: 9 Jun 2026
CVE-2026-6899 (opens in a new tab)How to fix?
Upgrade systerel/S2OPC to version 1.7.3 or higher.
Overview
Affected versions of this package are vulnerable to Improper Check for Certificate Revocation due to the CycloneCrypto cryptographic wrapper not properly checking all valid Certificate Revocation Lists (CRLs) for a given Certificate Authority. An attacker can establish a connection using a revoked certificate by exploiting the incomplete revocation check.