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CA Owner · United States of America

Internet Security Research Group

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Identity
CountryCCADBA text value provided by the CA Owner representing the physical address of their organization.
🇺🇸 United States of America
Documentation
Policy DocsCCADBNotes about the documentation, such as which language the documents are in, or additional documents that need to be listed, as configured by the CA Owner.
—
Doc RepositoryCCADBThe URL to the document repository pertaining to this certificate, as configured by the CA Owner.
Problem ReportingCCADBCCADB-published contact mechanisms for certificate problem reports and CA incident reports.
CCADB-published contact mechanisms for certificate problem reports and CA incident reports.
Internet Security Research Group
cert-prob-reports[at]letsencrypt[dot]org
https://letsencrypt.org/contact/
Mozilla CA Program — Known Bugzilla Cases (48)
Filter cases
#2044788 ASSIGNED Ca Certificate Compliance Self Reported Incident Incident Revocation Issue 7 comments Opened 2026-06-03 Still Open
Let's Encrypt: CRLs Temporarily Missing Revoked Serials
AI Summary
#2038351 ASSIGNED Ca Certificate Compliance Incident Self Reported Incident Certificate Misissuance 18 comments Opened 2026-05-08 Still Open
Let's Encrypt: Gen Y Cross-Certified Subordinate CAs missing serverAuth EKU
AI Summary
#1972745 RESOLVED Self Reported Incident 10 comments Opened 2025-06-18 · Closed 2025-07-30
Let's Encrypt: Deployed Unreviewed Boulder Code
AI Summary
#1966515 RESOLVED Certificate Misissuance 10 comments Opened 2025-05-14 · Closed 2025-06-04
Let's Encrypt: Issuance for Invalid Internationalized Domain Name
AI Summary
#1955721 RESOLVED Self Reported Incident Vulnerability Disclosure 11 comments Opened 2025-03-21 · Closed 2025-06-10
Let's Encrypt: Failure to Document Analysis of Detected Vulnerabilities
AI Summary
#1954861 RESOLVED Self Reported Incident Certificate Misissuance 10 comments Opened 2025-03-18 · Closed 2025-04-09
Let's Encrypt: Early CRL Removal Incident
AI Summary
#1921573 RESOLVED Self Reported Incident Policy Document Issue 12 comments Opened 2024-09-27 · Closed 2024-11-06
Let's Encrypt: No Meaningful Subject Distinguished Name
AI Summary
#1886876 RESOLVED Self Reported Incident Policy Document Issue 14 comments Opened 2024-03-21 · Closed 2024-04-17
Let's Encrypt: keyCompromise key blocking deviation from CP/CPS
AI Summary
#1863635 RESOLVED Audit Document 19 comments Opened 2023-11-07 · Closed 2025-11-10
Let's Encrypt Draft WebTrust Audit Documents
AI Summary
#1853719 RESOLVED Certificate Misissuance 9 comments Opened 2023-09-18 · Closed 2023-10-26
Once Revoked Let's Encrypt Certificate Actively Signing Malware
AI Summary
#1838667 RESOLVED Certificate Misissuance 9 comments Opened 2023-06-15 · Closed 2023-07-05
Let's Encrypt: Duplicate Serial Numbers
AI Summary
#1802059 RESOLVED Audit Related 4 comments Opened 2022-11-23 · Closed 2022-11-29
Let's Encrypt 2022 WebTrust Audit Documents
AI Summary
#1799755 RESOLVED Delayed Revocation 8 comments Opened 2022-11-08 · Closed 2024-05-09
Let's Encrypt: End Entity CRLs Not Reissued On Time
AI Summary
#1795483 RESOLVED Delayed Revocation 8 comments Opened 2022-10-14 · Closed 2023-02-22
Let's Encrypt: Delayed revocation for removed gTLD
AI Summary
#1793114 RESOLVED Self Reported Incident 23 comments Opened 2022-09-30 · Closed 2023-02-22
Let's Encrypt: Incomplete and Inconsistent CRLs
AI Summary
#1789521 RESOLVED Certificate Misissuance 4 comments Opened 2022-09-06 · Closed 2024-05-09
Let's Encrypt: Certificates issued to Elliptic Curve Debian Weak Keys
AI Summary
#1753123 RESOLVED Revocation Issue Self Reported Incident 4 comments Opened 2022-02-01 · Closed 2023-01-04
Let's Encrypt: Failure to provide OCSP Responses for some certificates
AI Summary
#1752670 RESOLVED Certificate Misissuance Self Reported Incident 6 comments Opened 2022-01-29 · Closed 2024-05-09
Let's Encrypt: TLS Using ALPN Allows Additional Identifiers in Challenge Certificate
AI Summary
#1751984 RESOLVED Incident Self Reported Incident 26 comments Opened 2022-01-25 · Closed 2023-02-22
Let's Encrypt: TLS Using ALPN TLS Version and OID
AI Summary
#1742704 RESOLVED Incident Self Reported Incident 3 comments Opened 2021-11-23 · Closed 2024-05-09
Let's Encrypt: Potential Denial of Service against websites with broad private key reuse
AI Summary
#1735247 RESOLVED Ca Certificate Compliance Certificate Misissuance 4 comments Opened 2021-10-11 · Closed 2023-02-22
Let's Encrypt: Mis-issued certificates related to SC48v2
AI Summary
#1729567 RESOLVED Delayed Revocation 8 comments Opened 2021-09-07 · Closed 2023-02-22
Let's Encrypt: Delay updating OCSP responses
AI Summary
#1715672 RESOLVED Delayed Revocation 18 comments Opened 2021-06-10 · Closed 2023-02-22
Let's Encrypt: Failure to revoke for Certificate Lifetime Incident
AI Summary
#1715455 RESOLVED Self Reported Incident 40 comments Opened 2021-06-09 · Closed 2024-01-10
Let's Encrypt: certificate lifetimes 90 days plus one second
AI Summary
#1701317 RESOLVED Ca Certificate Root Program 13 comments Opened 2021-03-26 · Closed 2022-11-14
ISRG Root X2 inclusion request
AI Summary
#1684112 RESOLVED Ca Certificate Compliance 5 comments Opened 2020-12-23 · Closed 2023-02-22
Let's Encrypt: Failure to audit log subscriber certificate OCSP updates
AI Summary
#1666047 RESOLVED Delayed Revocation 6 comments Opened 2020-09-18 · Closed 2023-02-22
Let's Encrypt: 302 total OCSP responses available beyond acceptable timelines
AI Summary
#1658437 RESOLVED Root Inclusion 2 comments Opened 2020-08-10 · Closed 2024-05-09
Let's Encrypt: intent to issue root and intermediate certificates with organizationName and CABF DV OID
AI Summary
#1648840 RESOLVED Ca Certificate Compliance 4 comments Opened 2020-06-26 · Closed 2023-02-22
Let's Encrypt: OCSP responses with no revocationReason
AI Summary
#1645276 RESOLVED Self Reported Incident 5 comments Opened 2020-06-12 · Closed 2023-02-22
Let's Encrypt: Expired ISRG Root OCSP X1 Certificate
AI Summary
#1639794 RESOLVED Delayed Revocation 13 comments Opened 2020-05-21 · Closed 2023-02-22
Let's Encrypt: Failure to revoke key-compromised certificate within 24 hours
AI Summary
#1627614 RESOLVED Delayed Revocation 5 comments Opened 2020-04-06 · Closed 2023-02-22
Let's Encrypt: Failure to revoke key-compromised certificates within 24 hours
AI Summary
#1625322 RESOLVED Delayed Revocation 10 comments Opened 2020-03-26 · Closed 2023-02-22
Let's Encrypt: Failure to revoke key-compromised certificates within 24 hours
AI Summary
#1619179 RESOLVED Delayed Revocation 21 comments Opened 2020-03-02 · Closed 2023-02-22
Let's Encrypt: Incomplete revocation for CAA rechecking bug
AI Summary
#1619047 RESOLVED Self Reported Incident Certificate Misissuance 16 comments Opened 2020-02-29 · Closed 2023-02-22
Let's Encrypt: CAA Rechecking bug
AI Summary
#1577652 RESOLVED Self Reported Incident Revocation Issue 16 comments Opened 2019-08-29 · Closed 2022-11-14
Let's Encrypt: OCSP Responder Returned "Unauthorized" for Some Precertificates
AI Summary
#1576789 RESOLVED Self Reported Incident Validation Issue 5 comments Opened 2019-08-27 · Closed 2024-05-09
Let's Encrypt: 2019.08.20 Incident: Incorrect OCSP responses under certain conditions
AI Summary
#1486650 RESOLVED Self Reported Incident Revocation Issue 3 comments Opened 2018-08-27 · Closed 2023-02-22
Let's Encrypt: OCSP "unauthorized" responses
AI Summary
#1462735 RESOLVED Ca Certificate Compliance Certificate Misissuance 3 comments Opened 2018-05-18 · Closed 2023-02-22
Let's Encrypt: Case-sensitive CAA tag processing
AI Summary
#1446080 RESOLVED Ca Certificate Compliance Self Reported Incident 4 comments Opened 2018-03-15 · Closed 2023-02-22
Let's Encrypt: Improper encoding of wildcard certificates
AI Summary
#1441413 RESOLVED Audit Document 7 comments Opened 2018-02-27 · Closed 2022-12-08
Audit documents for ISRG / Let's Encrypt
AI Summary
#1414039 RESOLVED Ca Certificate Compliance Self Reported Incident 28 comments Opened 2017-11-02 · Closed 2024-05-09
Let's Encrypt: Attacker-controlled google.tg certificate being used in the wild.
AI Summary
#1398427 RESOLVED Ca Certificate Compliance Certificate Misissuance 6 comments Opened 2017-09-09 · Closed 2023-02-22
Let's Encrypt: CAA Misissuances
AI Summary
#1391867 RESOLVED Ca Certificate Compliance Certificate Misissuance 2 comments Opened 2017-08-19 · Closed 2023-02-22
Let's Encrypt: Non-BR-Compliant Certificate Issuance
AI Summary
#1341718 RESOLVED Ca Documents 2 comments Opened 2017-02-22 · Closed 2022-12-08
ISRG / Let's Encrypt WebTrust audits
AI Summary
#1319609 RESOLVED Ca Certificate Compliance Certificate Misissuance 5 comments Opened 2016-11-23 · Closed 2023-02-22
Let's Encrypt: certs issued contrary to CPS due to incomplete blocklist
AI Summary
#1230797 RESOLVED Audit Related 8 comments Opened 2015-12-06 · Closed 2022-11-14
Distrust ISRG Subordinate Certificate and Remove It Until the CA is Compliant with Mozilla Policies
AI Summary
#1204656 RESOLVED Root Inclusion 65 comments Opened 2015-09-14 · Closed 2022-11-14
Add ISRG / Let's Encrypt root certificate
AI Summary
Certificates (40)
Filter by type
Certificate Type Trust Source agreement Capabilities Valid Until Actions
ISRG Root X1
Root
AppleChromeMicrosoftMozilla
 ✓
TLS
 2035-06-04
E5
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
E6
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
E7
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
E8
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
E9
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
ISRG Root X2
Expired
 Intermediate
AppleChromeMicrosoftMozilla
 — 2025-09-15
ISRG Root X2
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2032-09-02
ISRG Root X2
Revoked
 Intermediate
AppleChromeMicrosoftMozilla
 — 2032-09-02
Let's Encrypt Authority X1
Expired
 Intermediate
AppleChromeMicrosoftMozilla
 — 2020-06-04
Let's Encrypt Authority X2
Expired
 Intermediate
AppleChromeMicrosoftMozilla
 — 2020-06-04
Let's Encrypt Authority X3
Expired
 Intermediate
AppleChromeMicrosoftMozilla
 — 2021-10-06
Let's Encrypt Authority X4
Expired
 Intermediate
AppleChromeMicrosoftMozilla
 — 2021-10-06
R10
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
R11
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
R12
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
R13
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
R14
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
R3
Expired
 Intermediate
AppleChromeMicrosoftMozilla
 — 2025-09-15
R4
Expired
 Intermediate
AppleChromeMicrosoftMozilla
 — 2025-09-15
Root YR
Revoked
 Intermediate
AppleChromeMicrosoftMozilla
 — 2032-09-02
Root YR
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2032-09-02
ISRG Root X2
Root
AppleChromeMicrosoftMozilla
 ✓
TLS
 2040-09-17
E1
Expired
 Intermediate
AppleChromeMicrosoftMozilla
 — 2025-09-15
E2
Expired
 Intermediate
AppleChromeMicrosoftMozilla
 — 2025-09-15
E5
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
E6
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
E7
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
E8
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
E9
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2027-03-12
Root YE
Intermediate
AppleChromeMicrosoftMozilla
 i
TLS
 2032-09-02
Root YE
Revoked
 Intermediate
AppleChromeMicrosoftMozilla
 — 2032-09-02
Root YE
Root
AppleChromeMicrosoftMozilla
 — 2045-09-02
YE1
Intermediate
AppleChromeMicrosoftMozilla
 i — 2028-09-02
YE2
Intermediate
AppleChromeMicrosoftMozilla
 i — 2028-09-02
YE3
Intermediate
AppleChromeMicrosoftMozilla
 i — 2028-09-02
Root YR
Root
AppleChromeMicrosoftMozilla
 — 2045-09-02
YR1
Intermediate
AppleChromeMicrosoftMozilla
 i — 2028-09-02
YR2
Intermediate
AppleChromeMicrosoftMozilla
 i — 2028-09-02
YR3
Intermediate
AppleChromeMicrosoftMozilla
 i — 2028-09-02

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