The SSI printenv command in Apache Tomcat 9.0.0.M1 to 9.0.0.17, 8.5.0 to 8.5.39 and 7.0.0 to 7.0.93 echoes user provided data without escaping and is, therefore, vulnerable to XSS. SSI is disabled by default. The printenv command is intended for debugging and is unlikely to be present in a production website.
{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libservlet3.1-java",
            "binary_version": "8.0.32-1ubuntu1.10"
        },
        {
            "binary_name": "libtomcat8-java",
            "binary_version": "8.0.32-1ubuntu1.10"
        },
        {
            "binary_name": "tomcat8",
            "binary_version": "8.0.32-1ubuntu1.10"
        },
        {
            "binary_name": "tomcat8-admin",
            "binary_version": "8.0.32-1ubuntu1.10"
        },
        {
            "binary_name": "tomcat8-common",
            "binary_version": "8.0.32-1ubuntu1.10"
        },
        {
            "binary_name": "tomcat8-docs",
            "binary_version": "8.0.32-1ubuntu1.10"
        },
        {
            "binary_name": "tomcat8-examples",
            "binary_version": "8.0.32-1ubuntu1.10"
        },
        {
            "binary_name": "tomcat8-user",
            "binary_version": "8.0.32-1ubuntu1.10"
        }
    ]
}{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libtomcat8-embed-java",
            "binary_version": "8.5.39-1ubuntu1~18.04.3"
        },
        {
            "binary_name": "libtomcat8-java",
            "binary_version": "8.5.39-1ubuntu1~18.04.3"
        },
        {
            "binary_name": "tomcat8",
            "binary_version": "8.5.39-1ubuntu1~18.04.3"
        },
        {
            "binary_name": "tomcat8-admin",
            "binary_version": "8.5.39-1ubuntu1~18.04.3"
        },
        {
            "binary_name": "tomcat8-common",
            "binary_version": "8.5.39-1ubuntu1~18.04.3"
        },
        {
            "binary_name": "tomcat8-docs",
            "binary_version": "8.5.39-1ubuntu1~18.04.3"
        },
        {
            "binary_name": "tomcat8-examples",
            "binary_version": "8.5.39-1ubuntu1~18.04.3"
        },
        {
            "binary_name": "tomcat8-user",
            "binary_version": "8.5.39-1ubuntu1~18.04.3"
        }
    ]
}{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libtomcat9-embed-java",
            "binary_version": "9.0.16-3ubuntu0.18.04.1"
        },
        {
            "binary_name": "libtomcat9-java",
            "binary_version": "9.0.16-3ubuntu0.18.04.1"
        },
        {
            "binary_name": "tomcat9",
            "binary_version": "9.0.16-3ubuntu0.18.04.1"
        },
        {
            "binary_name": "tomcat9-admin",
            "binary_version": "9.0.16-3ubuntu0.18.04.1"
        },
        {
            "binary_name": "tomcat9-common",
            "binary_version": "9.0.16-3ubuntu0.18.04.1"
        },
        {
            "binary_name": "tomcat9-docs",
            "binary_version": "9.0.16-3ubuntu0.18.04.1"
        },
        {
            "binary_name": "tomcat9-examples",
            "binary_version": "9.0.16-3ubuntu0.18.04.1"
        },
        {
            "binary_name": "tomcat9-user",
            "binary_version": "9.0.16-3ubuntu0.18.04.1"
        }
    ]
}{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libservlet3.0-java",
            "binary_version": "7.0.52-1ubuntu0.16+esm1"
        },
        {
            "binary_name": "libtomcat7-java",
            "binary_version": "7.0.52-1ubuntu0.16+esm1"
        },
        {
            "binary_name": "tomcat7",
            "binary_version": "7.0.52-1ubuntu0.16+esm1"
        },
        {
            "binary_name": "tomcat7-admin",
            "binary_version": "7.0.52-1ubuntu0.16+esm1"
        },
        {
            "binary_name": "tomcat7-common",
            "binary_version": "7.0.52-1ubuntu0.16+esm1"
        },
        {
            "binary_name": "tomcat7-docs",
            "binary_version": "7.0.52-1ubuntu0.16+esm1"
        },
        {
            "binary_name": "tomcat7-examples",
            "binary_version": "7.0.52-1ubuntu0.16+esm1"
        },
        {
            "binary_name": "tomcat7-user",
            "binary_version": "7.0.52-1ubuntu0.16+esm1"
        }
    ]
}{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libservlet3.0-java",
            "binary_version": "7.0.68-1ubuntu0.4+esm2"
        },
        {
            "binary_name": "libtomcat7-java",
            "binary_version": "7.0.68-1ubuntu0.4+esm2"
        },
        {
            "binary_name": "tomcat7",
            "binary_version": "7.0.68-1ubuntu0.4+esm2"
        },
        {
            "binary_name": "tomcat7-admin",
            "binary_version": "7.0.68-1ubuntu0.4+esm2"
        },
        {
            "binary_name": "tomcat7-common",
            "binary_version": "7.0.68-1ubuntu0.4+esm2"
        },
        {
            "binary_name": "tomcat7-docs",
            "binary_version": "7.0.68-1ubuntu0.4+esm2"
        },
        {
            "binary_name": "tomcat7-examples",
            "binary_version": "7.0.68-1ubuntu0.4+esm2"
        },
        {
            "binary_name": "tomcat7-user",
            "binary_version": "7.0.68-1ubuntu0.4+esm2"
        }
    ]
}