Xcitium controversies
Controversies tied to this brand in public sources. A listing is not a finding of fault.
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2015
Let's Encrypt trademark applications
Comodo filed trademark applications involving the Let's Encrypt name, which was already publicly associated with the Internet Security Research Group’s certificate initiative. In 2016, Comodo announced that it had requested express abandonment of the applications.
2011
Fraudulent certificate issuance after affiliate account compromise
A compromised affiliate registration-authority account was used to issue unauthorized certificates for several domains. Comodo revoked the certificates, investigated the event, and reported additional controls. A later attempted reseller-account intrusion was blocked without compromise of the certificate-authority keys or fraudulent issuance.
2009
Certificates issued to known malware distributors
Comodo was accused of issuing digital certificates to parties associated with known malware. After being notified, the company revoked the certificates in question.