A Certificate Revocation List (CRL) is a blocklist of digital certificates deemed untrustworthy and is critical to online security. Used to confirm the validity of a website’s certificate through various stages of checking and authentication, CRL protects from security risks by alerting users to invalid certificates. Drawbacks include difficulty of maintenance and the potential for security risks due to processing delays. Alternatives include the Online Certificate Status Protocol (OCSP), which, while less secure, is faster and more efficient.

400+ SAP NetWeaver Devices Vulnerable to 0-Day Attacks that Exploited in the Wild
Shadow Servers have identified 454 vulnerable SAP NetWeaver systems affected by a critical zero-day flaw, CVE-2025-31324, allowing unauthenticated file uploads and potential system compromise. Discovered