It was discovered that Kerberos allowed the usage of weak cryptographic standards. An attacker could possibly use this issue to expose sensitive information.
This update introduces the allowrc4 and allowdes3 configuration options, and disables the usage of RC4 and 3DES ciphers by default. Users are advised to discontinue their usage and upgrade to stronger encryption protocols. If the use of the insecure RC4 and 3DES algorithms is necessary, they can be enabled with the aforementioned configuration options.
{
"availability": "No subscription required",
"binaries": [
{
"binary_name": "krb5-admin-server",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "krb5-gss-samples",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "krb5-k5tls",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "krb5-kdc",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "krb5-kdc-ldap",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "krb5-kpropd",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "krb5-locales",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "krb5-multidev",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "krb5-otp",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "krb5-pkinit",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "krb5-user",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "libgssapi-krb5-2",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "libgssrpc4",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "libk5crypto3",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "libkadm5clnt-mit11",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "libkadm5srv-mit11",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "libkdb5-9",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "libkrad-dev",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "libkrad0",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "libkrb5-3",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "libkrb5-dev",
"binary_version": "1.17-6ubuntu4.11"
},
{
"binary_name": "libkrb5support0",
"binary_version": "1.17-6ubuntu4.11"
}
]
}{
"ecosystem": "Ubuntu:20.04:LTS",
"cves": [
{
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"id": "CVE-2025-3576"
}
]
}
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7542-1.json"
{
"availability": "No subscription required",
"binaries": [
{
"binary_name": "krb5-admin-server",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "krb5-gss-samples",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "krb5-k5tls",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "krb5-kdc",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "krb5-kdc-ldap",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "krb5-kpropd",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "krb5-locales",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "krb5-multidev",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "krb5-otp",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "krb5-pkinit",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "krb5-user",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "libgssapi-krb5-2",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "libgssrpc4",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "libk5crypto3",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "libkadm5clnt-mit12",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "libkadm5srv-mit12",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "libkdb5-10",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "libkrad-dev",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "libkrad0",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "libkrb5-3",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "libkrb5-dev",
"binary_version": "1.19.2-2ubuntu0.7"
},
{
"binary_name": "libkrb5support0",
"binary_version": "1.19.2-2ubuntu0.7"
}
]
}{
"ecosystem": "Ubuntu:22.04:LTS",
"cves": [
{
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"id": "CVE-2025-3576"
}
]
}
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7542-1.json"
{
"availability": "No subscription required",
"binaries": [
{
"binary_name": "krb5-admin-server",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "krb5-gss-samples",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "krb5-k5tls",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "krb5-kdc",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "krb5-kdc-ldap",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "krb5-kpropd",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "krb5-locales",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "krb5-multidev",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "krb5-otp",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "krb5-pkinit",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "krb5-user",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libgssapi-krb5-2",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libgssrpc4t64",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libk5crypto3",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkadm5clnt-mit12",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkadm5srv-mit12",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkdb5-10t64",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkrad-dev",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkrad0",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkrb5-3",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkrb5-dev",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkrb5support0",
"binary_version": "1.20.1-6ubuntu2.6"
}
]
}{
"ecosystem": "Ubuntu:24.04:LTS",
"cves": [
{
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"id": "CVE-2025-3576"
}
]
}
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7542-1.json"
{
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "krb5-admin-server",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "krb5-gss-samples",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "krb5-kdc",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "krb5-kdc-ldap",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "krb5-locales",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "krb5-multidev",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "krb5-otp",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "krb5-pkinit",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "krb5-user",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libgssapi-krb5-2",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libgssrpc4",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libk5crypto3",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libkadm5clnt-mit9",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libkadm5srv-mit8",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libkadm5srv-mit9",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libkdb5-7",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libkrad-dev",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libkrad0",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libkrb5-3",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libkrb5-dev",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
},
{
"binary_name": "libkrb5support0",
"binary_version": "1.12+dfsg-2ubuntu5.4+esm7"
}
]
}{
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"cves": [
{
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"id": "CVE-2025-3576"
}
]
}
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7542-1.json"
{
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "krb5-admin-server",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "krb5-gss-samples",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "krb5-k5tls",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "krb5-kdc",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "krb5-kdc-ldap",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "krb5-locales",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "krb5-multidev",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "krb5-otp",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "krb5-pkinit",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "krb5-user",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "libgssapi-krb5-2",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "libgssrpc4",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "libk5crypto3",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "libkadm5clnt-mit9",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "libkadm5srv-mit9",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "libkdb5-8",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "libkrad-dev",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "libkrad0",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "libkrb5-3",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "libkrb5-dev",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
},
{
"binary_name": "libkrb5support0",
"binary_version": "1.13.2+dfsg-5ubuntu2.2+esm7"
}
]
}{
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"cves": [
{
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"id": "CVE-2025-3576"
}
]
}
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7542-1.json"
{
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "krb5-admin-server",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "krb5-gss-samples",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "krb5-k5tls",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "krb5-kdc",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "krb5-kdc-ldap",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "krb5-kpropd",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "krb5-locales",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "krb5-multidev",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "krb5-otp",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "krb5-pkinit",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "krb5-user",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "libgssapi-krb5-2",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "libgssrpc4",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "libk5crypto3",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "libkadm5clnt-mit11",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "libkadm5srv-mit11",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "libkdb5-9",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "libkrad-dev",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "libkrad0",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "libkrb5-3",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "libkrb5-dev",
"binary_version": "1.16-2ubuntu0.4+esm5"
},
{
"binary_name": "libkrb5support0",
"binary_version": "1.16-2ubuntu0.4+esm5"
}
]
}{
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"cves": [
{
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"id": "CVE-2025-3576"
}
]
}
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7542-1.json"