Clear-text protocols such as ``++ftp++``, ``++telnet++``, or ``++http++`` lack
encryption of transported data, as well as the capability to build an
authenticated connection. It means that an attacker able to sniff traffic from
the network can read, modify, or corrupt the transported content. These
protocols are not secure as they expose applications to an extensive range of
risks:

* sensitive data exposure
* traffic redirected  to a malicious endpoint
* malware-infected software update or installer
* execution of client-side code
* corruption of critical information

Even in the context of isolated networks like offline environments or segmented
cloud environments, the insider threat exists. Thus, attacks involving
communications being sniffed or tampered with can still happen.

For example, attackers could successfully compromise prior security layers by:

* bypassing isolation mechanisms
* compromising a component of the network
* getting the credentials of an internal IAM account (either from a service
account or an actual person)

In such cases, encrypting communications would decrease the chances of attackers
to successfully leak data or steal credentials from other network components.
By layering various security practices (segmentation and encryption, for
example), the application will follow the _defense-in-depth_ principle.

Note that using the ``++http++`` protocol is being deprecated by
https://blog.mozilla.org/security/2015/04/30/deprecating-non-secure-http[major web browsers].

In the past, it has led to the following vulnerabilities:

* https://nvd.nist.gov/vuln/detail/CVE-2019-6169[CVE-2019-6169]
* https://nvd.nist.gov/vuln/detail/CVE-2019-12327[CVE-2019-12327]
* https://nvd.nist.gov/vuln/detail/CVE-2019-11065[CVE-2019-11065]