Telia: invalid IP value in SAN DNS field

Telia Company reported an incident involving three invalid certificates issued in 2016, where IP values were incorrectly stored in the SAN DNS field instead of the SAN IP field. The issue was identified on January 29, 2019, and the certificates were revoked by January 31, 2019. Telia has since implemented automatic testing to prevent similar issues in the future. A mass scan of their certificates revealed additional errors, leading to further revocations and improvements in their certificate issuance process.

1. 2019-01-29 Telia informed about invalid certificates
2. 2019-01-31 Certificates revoked
3. 2019-02-01 Preliminary incident report created
4. 2019-02-04 Complete incident report submitted
5. 2019-02-12 Mass zlint scan completed