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Home > Web Hosting > Let’s Encrypt preparing to revoke the latest certificates

Let’s Encrypt preparing to revoke the latest certificates

Let's Encrypt announced that the organization will start revoking certificates issued within the last 90 days.


Erdem Yasar Erdem Yasar
January 26, 2022
1 min read
Let's Encrypt preparing to revoke the latest certificates

Non-profit certificate authority, Let’s Encrypt announced that the organization will start revoking certain SSL/TLS certificates issued within the last 90 days. Let’s Encrypt stated that a third party reported that there are two irregularities in the implementation of the “TLS Using ALPN” validation method in the Boulder codebase. The organization made the changes that the TLS-ALPN-01 challenge validation works.

Starts on 28 January

Let’s Encrypt stated that the certificates that were issued and validated before the fix are considered mis-issued. The organization will start revoking these certificates, estimated at less than 1% of active certificates, on 28 January. The organization is sending notifications via email if the subscribers’ ACME account email address is valid.

According to the statement, the changes are only affecting clients that use TLS-ALPN-01. Let’s Encrypt also stated that more information will be provided about the incident in the next few days. Let’s Encrypt also announced,

« First, we now guarantee that our client which reaches out to conduct the “acme-tls/1” handshake will negotiate TLS version 1.2 or higher. If your ACME client or integration only supports a maximum TLS version of 1.1 when conducting the TLS-ALPN-01 challenge, it will break. We are not aware of any ACME clients with this limitation.

Second, we no longer support the legacy 1.3.6.1.5.5.7.1.30.1 OID which was used to identify the acmeIdentifier extension in earlier drafts of RFC 8737. We now only accept the standardized OID 1.3.6.1.5.5.7.1.31. If your client uses the wrong OID when constructing the certificate used for the TLS-ALPN-01 handshake, it will break. Please either update your client, or switch to using a different validation method. »

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Tags: Let's Encrypt
Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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