|
2018.01.09 Issue with TLS-SNI-01 and Shared Hosting Infrastructure
|
|
4
|
61252
|
January 12, 2018
|
|
2020.02.29 CAA Rechecking Bug
|
|
3
|
138922
|
March 7, 2020
|
|
May 19, 2017: OCSP and Issuance Outage Postmortem
|
|
0
|
25080
|
May 25, 2017
|
|
2018.01.11 Update Regarding ACME TLS-SNI and Shared Hosting Infrastructure
|
|
3
|
73052
|
January 13, 2018
|
|
2025.07.21 Complete API outage
|
|
0
|
442
|
September 2, 2025
|
|
2022.01.25 Issue with TLS-ALPN-01 Validation Method
|
|
2
|
38103
|
February 2, 2022
|
|
2021.06.08 Certificate Lifetime Incident (valid for an extra one second)
|
|
0
|
26019
|
June 9, 2021
|
|
2023.06.15 Certificate Policies Extension Mismatch
|
|
4
|
2464
|
June 20, 2023
|
|
Log4j vulnerability (CVE-2021-44228)
|
|
0
|
4729
|
December 11, 2021
|
|
2018.07.30 Domain Resolution Interruption
|
|
0
|
3578
|
August 2, 2018
|
|
2019.11.17 Autoincrement maxed out
|
|
1
|
4258
|
November 23, 2019
|
|
2026.05.08 Gen Y Cross-Certified Subordinate CAs missing serverAuth EKU
|
|
2
|
1633
|
May 21, 2026
|
|
API traffic from Plesk is blocked
|
|
1
|
1124
|
April 28, 2022
|
|
Email Address Disclosures, Preliminary Report, June 11 2016
|
|
0
|
38226
|
June 11, 2016
|
|
2021.10.11 Certificate Mis-Issuance related to Internationalized Domain Names (IDN) formatting
|
|
0
|
1133
|
October 13, 2021
|
|
Let's Encrypt 2026 Mass Revocation Simulation
|
|
0
|
1034
|
March 17, 2026
|
|
Expired OCSP responses, December 12
|
|
5
|
6190
|
December 19, 2016
|
|
2020.06.08 Delegated OCSP Signer Expiration for Alternate Chains
|
|
0
|
1517
|
June 12, 2020
|
|
OCSP and issuance outage, 2017-05-19
|
|
0
|
4687
|
May 19, 2017
|
|
2024.09.27 No Meaningful Subject Distinguished Name
|
|
3
|
727
|
October 4, 2024
|
|
2021.09.07 Delay updating OCSP responses
|
|
2
|
1168
|
September 10, 2021
|
|
2021.06.09 Non-Revocation of Certificates from Previous Incident (certificate lifetimes)
|
|
0
|
1258
|
June 10, 2021
|
|
2018.03.12 Wildcard Certificate Encoding Issue
|
|
0
|
5907
|
March 13, 2018
|
|
2020.12.22 Failure to audit log subscriber certificate OCSP updates
|
|
0
|
1013
|
December 23, 2020
|
|
2025.12.16 ACME API Outage
|
|
0
|
279
|
December 19, 2025
|
|
2019.08.20 Incorrect OCSP responses under certain conditions
|
|
0
|
1380
|
August 27, 2019
|
|
CAA Check Incident: December 7, 2015
|
|
0
|
4209
|
January 27, 2016
|
|
2024.03.28 CP/CPS Deviation Regarding keyCompromise Key Blocking
|
|
0
|
392
|
March 28, 2024
|
|
2025.03.18 Early CRL Removal
|
|
1
|
459
|
March 25, 2025
|
|
Email Address Disclosures, June 11 2016
|
|
0
|
10763
|
June 14, 2016
|
|
2018.11.30 Production Google CT Log Submission Failures
|
|
0
|
1874
|
December 18, 2018
|
|
2018.05.18 CAA tag value case sensitivity incident
|
|
0
|
1881
|
May 18, 2018
|
|
ACME TLS-SNI-01 validation disabled due to vulnerability
|
|
0
|
9534
|
January 10, 2018
|
|
2022.01.29 Failure to provide OCSP Responses for some certificates
|
|
0
|
928
|
February 2, 2022
|
|
2020.09.08 Failure to renew OCSP responses within acceptable timelines
|
|
0
|
995
|
September 28, 2020
|
|
Outage: December 15, 2015
|
|
0
|
2736
|
January 9, 2016
|
|
2018.08.23 OCSP Responder Incident
|
|
0
|
2431
|
August 23, 2018
|
|
2022.11.08 End Entity CRLs Not Reissued On Time
|
|
0
|
600
|
November 16, 2022
|
|
2025.06.09 Deployed Unreviewed Boulder Code
|
|
0
|
210
|
June 18, 2025
|
|
July 17, 2017: Partial OCSP and Complete Issuance Outage Postmortem
|
|
0
|
1856
|
July 19, 2017
|
|
2019.08.28 Let’s Encrypt OCSP Responder Returned “Unauthorized” for Some Precertificates
|
|
0
|
1841
|
August 29, 2019
|
|
2017.09.09 Late Weak Key Revocation
|
|
0
|
2794
|
September 19, 2017
|
|
August 10, 2017: Unicode Normalization Compliance Incident
|
|
0
|
2329
|
August 11, 2017
|
|
2017.09.08 Expired DNSSEC Response Incident
|
|
0
|
2780
|
September 19, 2017
|
|
Expiration warnings going out late
|
|
0
|
2517
|
June 30, 2016
|
|
2019.01.03 Donor Email Option Not Respected
|
|
0
|
1413
|
January 9, 2019
|
|
2017.09.08 CAA Checking Algorithm Incident
|
|
0
|
2232
|
September 19, 2017
|
|
2018.05.29 Subscriber Email Address Disclosure
|
|
0
|
1895
|
May 30, 2018
|
|
2026.06.03 CRLs Temporarily Missing Revoked Serials
|
|
0
|
136
|
June 3, 2026
|
|
2025.03.21Failure to Document Analysis of Detected Vulnerabilities
|
|
0
|
206
|
March 21, 2025
|