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{
"schema_version": "1.7.0",
"id": "USN-5034-2",
"summary": "c-ares vulnerability",
"details": "USN-5034-1 fixed a vulnerability in c-ares. This update provides\nthe corresponding update for Ubuntu 16.04 ESM.\n\nOriginal advisory details:\n\n Philipp Jeitner and Haya Shulman discovered that c-ares incorrectly\n validated certain hostnames returned by DNS servers. A remote attacker\n could possibly use this issue to perform Domain Hijacking attacks.\n",
"aliases": [],
"upstream": [
"UBUNTU-CVE-2021-3672"
],
"related": [],
"published": "2021-08-10T17:15:47Z",
"modified": "2026-06-25T10:46:01Z",
"affected": [
{
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "c-ares",
"purl": "pkg:deb/ubuntu/c-ares@1.10.0-3ubuntu0.2+esm1?arch=source&distro=esm-infra/xenial"
},
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.10.0-3ubuntu0.2+esm1"
}
]
}
],
"versions": [
"1.10.0-2",
"1.10.0-3",
"1.10.0-3ubuntu0.1",
"1.10.0-3ubuntu0.2"
],
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libc-ares2",
"binary_version": "1.10.0-3ubuntu0.2+esm1"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
},
"database_specific": {
"cves_map": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"cves": [
{
"id": "CVE-2021-3672",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
]
}
}
}
],
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5034-2"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-3672"
}
]
}