Google Trust Services: Improper OCSP response for intermediate certificate

Google Trust Services LLC reported an incident regarding an improper OCSP response generated for its intermediate CA, GTSY1. The issue arose during a signing ceremony in October 2018, where a serial number mismatch was discovered on January 11, 2019. Although the incorrect OCSP response did not impact any subscribers or relying parties, the incident highlighted the need for improved monitoring and linting processes. Remediation actions included publishing a corrected OCSP response and enhancing the configuration checks to prevent similar errors in the future.

1. 2018-10-18 Config file created and submitted to version control.
2. 2018-10-29 OCSP responses created and signed.
3. 2019-01-11 Serial mismatch discovered.
4. 2019-01-18 New OCSP response published.