A curl vulnerability has been released for Ubuntu Linux 14.04 ESM.

USN-4903-1: curl vulnerability

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Ubuntu Security Notice USN-4903-1
April 07, 2021

curl vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM

Summary:

curl could be made to expose sensitive information over the
network.

Software Description:
- curl: HTTP, HTTPS, and FTP client and client libraries

Details:

Viktor Szakats discovered that curl did not strip off user credentials
from referrer header fields. A remote attacker could possibly use this
issue to obtain sensitive information.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 ESM:
curl 7.35.0-1ubuntu2.20+esm7
libcurl3 7.35.0-1ubuntu2.20+esm7
libcurl3-gnutls 7.35.0-1ubuntu2.20+esm7
libcurl3-nss 7.35.0-1ubuntu2.20+esm7

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-4903-1
CVE-2021-22876