Cyber.mil serving file downloads using TLS certificate which expired 3 days ago

TechStrider

23 Mar 2026 — 2 min read

Introduction to the Issue

I recently came across a concerning report about Cyber.mil, a prominent cybersecurity website, serving file downloads using a TLS certificate that expired 3 days ago. This is a significant issue, as it can compromise the security and trust of the website's users. In this article, we'll explore the implications of this problem and what it means for the cybersecurity community.

Why this matters

The use of an expired TLS certificate is a serious security concern, as it can allow attackers to intercept and manipulate sensitive information. When a user visits a website with an expired certificate, their browser will typically display a warning message, indicating that the connection is not secure. This can lead to a loss of trust in the website and its owners. In the case of Cyber.mil, which provides critical cybersecurity resources and information, this is particularly problematic.

Potential Consequences

Some potential consequences of using an expired TLS certificate include:

Man-in-the-middle attacks: An attacker could intercept and manipulate sensitive information, such as login credentials or file downloads.
Data breaches: An expired certificate can increase the risk of data breaches, as attackers may be able to exploit vulnerabilities in the website's security.
Loss of trust: Users may lose trust in the website and its owners, which can damage the reputation of the organization and undermine its mission.

How to check for expired certificates

To check if a website is using an expired TLS certificate, you can use a tool like OpenSSL. Here's an example of how to do this:

openssl s_client -connect cyber.mil:443 -servername cyber.mil

This will display information about the website's TLS certificate, including its expiration date.

How to fix the issue

To fix the issue, the owners of Cyber.mil need to obtain a new TLS certificate and install it on their website. This is a relatively straightforward process, but it requires prompt attention to ensure the security and trust of the website's users.

Verdict

Who is this for? This issue is relevant to anyone who uses Cyber.mil or relies on its resources for cybersecurity information. It's also a reminder to all website owners of the importance of maintaining up-to-date TLS certificates to ensure the security and trust of their users. Are you surprised by the lack of attention to this critical security issue, and what do you think can be done to prevent similar problems in the future?

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