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Let’s Encrypt Vulnerability Allows Unauthorized TLS Certificate Issuance

/ 1 min read

🕵️‍♂️ Let’s Encrypt Vulnerability Exposed: Attackers Can Issue TLS Certificates for Any Domain. A recent article reveals a significant security flaw in Let’s Encrypt (LE), where attackers can exploit the cleartext HTTP method used for ACME challenges to obtain valid TLS certificates for domains they do not own. This loophole allows attackers to intercept traffic and decrypt TLS communications, undermining the very purpose of TLS. The article outlines a practical guide for executing this attack, discusses the historical context of Certificate Transparency and CAA failures, and proposes solutions to close this vulnerability. It emphasizes the need for stronger authentication methods and better monitoring of certificate issuance to enhance TLS security.

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