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About the Incidents category
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0
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3142
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January 9, 2016
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2026.09.23 Root CRLs Missing Reason Code
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2
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268
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September 23, 2026
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2026.08.10 CPS missing root program attestation
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0
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285
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August 10, 2026
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2026.06.03 CRLs Temporarily Missing Revoked Serials
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0
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242
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June 3, 2026
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2026.05.08 Gen Y Cross-Certified Subordinate CAs missing serverAuth EKU
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2
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1939
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May 21, 2026
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Let's Encrypt 2026 Mass Revocation Simulation
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0
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1152
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March 17, 2026
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2025.12.16 ACME API Outage
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0
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313
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December 19, 2025
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2025.07.21 Complete API outage
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0
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498
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September 2, 2025
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2025.06.09 Deployed Unreviewed Boulder Code
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0
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237
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June 18, 2025
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2025.03.18 Early CRL Removal
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1
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522
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March 25, 2025
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2025.03.21Failure to Document Analysis of Detected Vulnerabilities
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0
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232
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March 21, 2025
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2024.09.27 No Meaningful Subject Distinguished Name
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3
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792
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October 4, 2024
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2024.03.28 CP/CPS Deviation Regarding keyCompromise Key Blocking
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0
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428
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March 28, 2024
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2023.06.15 Certificate Policies Extension Mismatch
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4
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2538
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June 20, 2023
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2022.11.08 End Entity CRLs Not Reissued On Time
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0
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642
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November 16, 2022
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API traffic from Plesk is blocked
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1
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1152
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April 28, 2022
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2022.01.29 Failure to provide OCSP Responses for some certificates
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0
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952
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February 2, 2022
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2022.01.25 Issue with TLS-ALPN-01 Validation Method
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2
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38233
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February 2, 2022
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Log4j vulnerability (CVE-2021-44228)
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0
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4763
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December 11, 2021
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2021.10.11 Certificate Mis-Issuance related to Internationalized Domain Names (IDN) formatting
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0
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1171
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October 13, 2021
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2021.09.07 Delay updating OCSP responses
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2
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1215
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September 10, 2021
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2021.06.09 Non-Revocation of Certificates from Previous Incident (certificate lifetimes)
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0
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1293
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June 10, 2021
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2021.06.08 Certificate Lifetime Incident (valid for an extra one second)
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0
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26082
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June 9, 2021
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2020.12.22 Failure to audit log subscriber certificate OCSP updates
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0
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1043
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December 23, 2020
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2020.09.08 Failure to renew OCSP responses within acceptable timelines
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0
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1018
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September 28, 2020
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2020.06.08 Delegated OCSP Signer Expiration for Alternate Chains
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0
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1541
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June 12, 2020
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2020.02.29 CAA Rechecking Bug
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3
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139307
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March 7, 2020
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2019.11.17 Autoincrement maxed out
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1
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4296
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November 23, 2019
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2019.08.28 Let’s Encrypt OCSP Responder Returned “Unauthorized” for Some Precertificates
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0
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1867
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August 29, 2019
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2019.08.20 Incorrect OCSP responses under certain conditions
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0
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1413
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August 27, 2019
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