|
2018.01.09 Issue with TLS-SNI-01 and Shared Hosting Infrastructure
|
|
3
|
61292
|
January 12, 2018
|
|
2020.02.29 CAA Rechecking Bug
|
|
3
|
139040
|
March 7, 2020
|
|
May 19, 2017: OCSP and Issuance Outage Postmortem
|
|
0
|
25096
|
May 25, 2017
|
|
2018.01.11 Update Regarding ACME TLS-SNI and Shared Hosting Infrastructure
|
|
1
|
73113
|
January 12, 2018
|
|
2025.07.21 Complete API outage
|
|
0
|
457
|
September 2, 2025
|
|
2022.01.25 Issue with TLS-ALPN-01 Validation Method
|
|
2
|
38150
|
February 2, 2022
|
|
2021.06.08 Certificate Lifetime Incident (valid for an extra one second)
|
|
0
|
26025
|
June 9, 2021
|
|
2023.06.15 Certificate Policies Extension Mismatch
|
|
4
|
2474
|
June 20, 2023
|
|
Log4j vulnerability (CVE-2021-44228)
|
|
0
|
4735
|
December 11, 2021
|
|
2018.07.30 Domain Resolution Interruption
|
|
0
|
3582
|
August 2, 2018
|
|
2019.11.17 Autoincrement maxed out
|
|
1
|
4263
|
November 23, 2019
|
|
2026.05.08 Gen Y Cross-Certified Subordinate CAs missing serverAuth EKU
|
|
2
|
1756
|
May 21, 2026
|
|
API traffic from Plesk is blocked
|
|
1
|
1125
|
April 28, 2022
|
|
Email Address Disclosures, Preliminary Report, June 11 2016
|
|
0
|
38247
|
June 11, 2016
|
|
2021.10.11 Certificate Mis-Issuance related to Internationalized Domain Names (IDN) formatting
|
|
0
|
1137
|
October 13, 2021
|
|
Let's Encrypt 2026 Mass Revocation Simulation
|
|
0
|
1086
|
March 17, 2026
|
|
Expired OCSP responses, December 12
|
|
5
|
6200
|
December 19, 2016
|
|
2020.06.08 Delegated OCSP Signer Expiration for Alternate Chains
|
|
0
|
1521
|
June 12, 2020
|
|
OCSP and issuance outage, 2017-05-19
|
|
0
|
4690
|
May 19, 2017
|
|
2024.09.27 No Meaningful Subject Distinguished Name
|
|
3
|
741
|
October 4, 2024
|
|
2021.09.07 Delay updating OCSP responses
|
|
2
|
1175
|
September 10, 2021
|
|
2021.06.09 Non-Revocation of Certificates from Previous Incident (certificate lifetimes)
|
|
0
|
1265
|
June 10, 2021
|
|
2018.03.12 Wildcard Certificate Encoding Issue
|
|
0
|
5923
|
March 13, 2018
|
|
2020.12.22 Failure to audit log subscriber certificate OCSP updates
|
|
0
|
1020
|
December 23, 2020
|
|
2025.12.16 ACME API Outage
|
|
0
|
289
|
December 19, 2025
|
|
2019.08.20 Incorrect OCSP responses under certain conditions
|
|
0
|
1384
|
August 27, 2019
|
|
CAA Check Incident: December 7, 2015
|
|
0
|
4223
|
January 27, 2016
|
|
2024.03.28 CP/CPS Deviation Regarding keyCompromise Key Blocking
|
|
0
|
399
|
March 28, 2024
|
|
2025.03.18 Early CRL Removal
|
|
1
|
465
|
March 25, 2025
|
|
Email Address Disclosures, June 11 2016
|
|
0
|
10785
|
June 14, 2016
|
|
2018.11.30 Production Google CT Log Submission Failures
|
|
0
|
1878
|
December 18, 2018
|
|
2018.05.18 CAA tag value case sensitivity incident
|
|
0
|
1889
|
May 18, 2018
|
|
ACME TLS-SNI-01 validation disabled due to vulnerability
|
|
0
|
9535
|
January 10, 2018
|
|
2022.01.29 Failure to provide OCSP Responses for some certificates
|
|
0
|
930
|
February 2, 2022
|
|
2020.09.08 Failure to renew OCSP responses within acceptable timelines
|
|
0
|
1001
|
September 28, 2020
|
|
Outage: December 15, 2015
|
|
0
|
2741
|
January 9, 2016
|
|
2018.08.23 OCSP Responder Incident
|
|
0
|
2433
|
August 23, 2018
|
|
2022.11.08 End Entity CRLs Not Reissued On Time
|
|
0
|
605
|
November 16, 2022
|
|
2025.06.09 Deployed Unreviewed Boulder Code
|
|
0
|
219
|
June 18, 2025
|
|
2026.08.10 CPS missing root program attestation
|
|
0
|
208
|
August 10, 2026
|
|
July 17, 2017: Partial OCSP and Complete Issuance Outage Postmortem
|
|
0
|
1864
|
July 19, 2017
|
|
2019.08.28 Let’s Encrypt OCSP Responder Returned “Unauthorized” for Some Precertificates
|
|
0
|
1845
|
August 29, 2019
|
|
2017.09.09 Late Weak Key Revocation
|
|
0
|
2794
|
September 19, 2017
|
|
August 10, 2017: Unicode Normalization Compliance Incident
|
|
0
|
2334
|
August 11, 2017
|
|
2017.09.08 Expired DNSSEC Response Incident
|
|
0
|
2782
|
September 19, 2017
|
|
Expiration warnings going out late
|
|
0
|
2523
|
June 30, 2016
|
|
2019.01.03 Donor Email Option Not Respected
|
|
0
|
1415
|
January 9, 2019
|
|
2017.09.08 CAA Checking Algorithm Incident
|
|
0
|
2242
|
September 19, 2017
|
|
2018.05.29 Subscriber Email Address Disclosure
|
|
0
|
1908
|
May 30, 2018
|
|
2026.06.03 CRLs Temporarily Missing Revoked Serials
|
|
0
|
185
|
June 3, 2026
|