ubuntu-cve-2018-20843
Vulnerability from osv_ubuntu
Published
2019-06-24 00:00
Modified
2026-05-28 04:03
Summary
Details
In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).
Severity
7.5 (High)
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "expat",
"binary_version": "2.1.0-4ubuntu1.4+esm1"
},
{
"binary_name": "lib64expat1",
"binary_version": "2.1.0-4ubuntu1.4+esm1"
},
{
"binary_name": "libexpat1",
"binary_version": "2.1.0-4ubuntu1.4+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "expat",
"purl": "pkg:deb/ubuntu/expat@2.1.0-4ubuntu1.4+esm1?arch=source\u0026distro=trusty/esm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.0-4ubuntu1.4+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.1.0-4",
"2.1.0-4ubuntu1",
"2.1.0-4ubuntu1.1",
"2.1.0-4ubuntu1.2",
"2.1.0-4ubuntu1.3",
"2.1.0-4ubuntu1.4"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libvtk-java",
"binary_version": "5.8.0-14.1ubuntu3+esm1"
},
{
"binary_name": "libvtk5.8",
"binary_version": "5.8.0-14.1ubuntu3+esm1"
},
{
"binary_name": "libvtk5.8-qt4",
"binary_version": "5.8.0-14.1ubuntu3+esm1"
},
{
"binary_name": "python-vtk",
"binary_version": "5.8.0-14.1ubuntu3+esm1"
},
{
"binary_name": "tcl-vtk",
"binary_version": "5.8.0-14.1ubuntu3+esm1"
},
{
"binary_name": "vtk-examples",
"binary_version": "5.8.0-14.1ubuntu3+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "vtk",
"purl": "pkg:deb/ubuntu/vtk@5.8.0-14.1ubuntu3+esm1?arch=source\u0026distro=trusty/esm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.8.0-14.1ubuntu3+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.8.0-14ubuntu1",
"5.8.0-14ubuntu3",
"5.8.0-14.1ubuntu2",
"5.8.0-14.1ubuntu3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcoin80",
"binary_version": "3.1.4~abc9f50-4ubuntu2+esm2"
},
{
"binary_name": "libcoin80-runtime",
"binary_version": "3.1.4~abc9f50-4ubuntu2+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "coin3",
"purl": "pkg:deb/ubuntu/coin3@3.1.4~abc9f50-4ubuntu2+esm2?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.4~abc9f50-3",
"3.1.4~abc9f50-4",
"3.1.4~abc9f50-4ubuntu2",
"3.1.4~abc9f50-4ubuntu2+esm1",
"3.1.4~abc9f50-4ubuntu2+esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "vnc4server",
"binary_version": "4.1.1+xorg4.3.0-37ubuntu5.0.2+esm1"
},
{
"binary_name": "xvnc4viewer",
"binary_version": "4.1.1+xorg4.3.0-37ubuntu5.0.2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "vnc4",
"purl": "pkg:deb/ubuntu/vnc4@4.1.1+xorg4.3.0-37ubuntu5.0.2+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.1.1+xorg4.3.0-37ubuntu5",
"4.1.1+xorg4.3.0-37ubuntu5.0.1",
"4.1.1+xorg4.3.0-37ubuntu5.0.2",
"4.1.1+xorg4.3.0-37ubuntu5.0.2+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxmlrpc-c++8",
"binary_version": "1.33.06-0ubuntu1+esm1"
},
{
"binary_name": "libxmlrpc-core-c3",
"binary_version": "1.33.06-0ubuntu1+esm1"
},
{
"binary_name": "xmlrpc-api-utils",
"binary_version": "1.33.06-0ubuntu1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "xmlrpc-c",
"purl": "pkg:deb/ubuntu/xmlrpc-c@1.33.06-0ubuntu1+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.16.33-3.2ubuntu3",
"1.33.06-0ubuntu1",
"1.33.06-0ubuntu1+esm1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "expat",
"binary_version": "2.1.0-7ubuntu0.16.04.4"
},
{
"binary_name": "lib64expat1",
"binary_version": "2.1.0-7ubuntu0.16.04.4"
},
{
"binary_name": "libexpat1",
"binary_version": "2.1.0-7ubuntu0.16.04.4"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "expat",
"purl": "pkg:deb/ubuntu/expat@2.1.0-7ubuntu0.16.04.4?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.0-7ubuntu0.16.04.4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.1.0-7",
"2.1.0-7ubuntu0.16.04.1",
"2.1.0-7ubuntu0.16.04.2",
"2.1.0-7ubuntu0.16.04.3"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libxmltok1",
"binary_version": "1.2-3ubuntu0.16.04.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "libxmltok",
"purl": "pkg:deb/ubuntu/libxmltok@1.2-3ubuntu0.16.04.1~esm2?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2-3ubuntu0.16.04.1~esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2-3build3",
"1.2-3ubuntu0.16.04.1~esm1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libvtk-java",
"binary_version": "5.10.1+dfsg-2.1ubuntu0.1~esm1"
},
{
"binary_name": "libvtk5.10",
"binary_version": "5.10.1+dfsg-2.1ubuntu0.1~esm1"
},
{
"binary_name": "libvtk5.10-qt4",
"binary_version": "5.10.1+dfsg-2.1ubuntu0.1~esm1"
},
{
"binary_name": "python-vtk",
"binary_version": "5.10.1+dfsg-2.1ubuntu0.1~esm1"
},
{
"binary_name": "tcl-vtk",
"binary_version": "5.10.1+dfsg-2.1ubuntu0.1~esm1"
},
{
"binary_name": "vtk-examples",
"binary_version": "5.10.1+dfsg-2.1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "vtk",
"purl": "pkg:deb/ubuntu/vtk@5.10.1+dfsg-2.1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.10.1+dfsg-2.1ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.10.1+dfsg-2",
"5.10.1+dfsg-2build3",
"5.10.1+dfsg-2.1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ayttm",
"binary_version": "0.6.3-3ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "ayttm",
"purl": "pkg:deb/ubuntu/ayttm@0.6.3-3ubuntu0.1~esm1?arch=source\u0026distro=esm-apps-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.6.3-3build1",
"0.6.3-3ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "cableswig",
"binary_version": "0.1.0+git20150808-2ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "cableswig",
"purl": "pkg:deb/ubuntu/cableswig@0.1.0+git20150808-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.1.0+git20150808-1",
"0.1.0+git20150808-2",
"0.1.0+git20150808-2ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "cadaver",
"binary_version": "0.23.3-2ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "cadaver",
"purl": "pkg:deb/ubuntu/cadaver@0.23.3-2ubuntu2?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.23.3-2ubuntu2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcoin80-runtime",
"binary_version": "3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm2"
},
{
"binary_name": "libcoin80v5",
"binary_version": "3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "coin3",
"purl": "pkg:deb/ubuntu/coin3@3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.4~abc9f50+dfsg1-1",
"3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm1",
"3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "insighttoolkit3-examples",
"binary_version": "3.20.1+git20120521-6ubuntu0.1~esm1"
},
{
"binary_name": "libinsighttoolkit3.20",
"binary_version": "3.20.1+git20120521-6ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "insighttoolkit",
"purl": "pkg:deb/ubuntu/insighttoolkit@3.20.1+git20120521-6ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.20.1+git20120521-6",
"3.20.1+git20120521-6build1",
"3.20.1+git20120521-6ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "insighttoolkit4-examples",
"binary_version": "4.9.0-4ubuntu1.1"
},
{
"binary_name": "insighttoolkit4-python",
"binary_version": "4.9.0-4ubuntu1.1"
},
{
"binary_name": "libinsighttoolkit4.9",
"binary_version": "4.9.0-4ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "insighttoolkit4",
"purl": "pkg:deb/ubuntu/insighttoolkit4@4.9.0-4ubuntu1.1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.8.1-1ubuntu3",
"4.8.1-1ubuntu4",
"4.8.2-3.1ubuntu1",
"4.9.0-3ubuntu2",
"4.9.0-4ubuntu1",
"4.9.0-4ubuntu1.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "matanza",
"binary_version": "0.13+ds1-5"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "matanza",
"purl": "pkg:deb/ubuntu/matanza@0.13+ds1-5?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.13+ds1-5"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "swish-e",
"binary_version": "2.4.7-4ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "swish-e",
"purl": "pkg:deb/ubuntu/swish-e@2.4.7-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.4.7-4",
"2.4.7-4build1",
"2.4.7-4ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "vnc4server",
"binary_version": "4.1.1+xorg4.3.0-37.3ubuntu2.1+esm1"
},
{
"binary_name": "xvnc4viewer",
"binary_version": "4.1.1+xorg4.3.0-37.3ubuntu2.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "vnc4",
"purl": "pkg:deb/ubuntu/vnc4@4.1.1+xorg4.3.0-37.3ubuntu2.1+esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.1.1+xorg4.3.0-37.3ubuntu2",
"4.1.1+xorg4.3.0-37.3ubuntu2.1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libxmlrpc-c++8v5",
"binary_version": "1.33.14-1ubuntu1+esm1"
},
{
"binary_name": "libxmlrpc-core-c3",
"binary_version": "1.33.14-1ubuntu1+esm1"
},
{
"binary_name": "xmlrpc-api-utils",
"binary_version": "1.33.14-1ubuntu1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "xmlrpc-c",
"purl": "pkg:deb/ubuntu/xmlrpc-c@1.33.14-1ubuntu1+esm1?arch=source\u0026distro=esm-apps-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.33.14-0.2ubuntu3",
"1.33.14-1ubuntu1",
"1.33.14-1ubuntu1+esm1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "expat",
"binary_version": "2.2.5-3ubuntu0.1"
},
{
"binary_name": "libexpat1",
"binary_version": "2.2.5-3ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "expat",
"purl": "pkg:deb/ubuntu/expat@2.2.5-3ubuntu0.1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.2.5-3ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.2.3-1",
"2.2.3-2",
"2.2.5-0ubuntu2",
"2.2.5-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "cadaver",
"binary_version": "0.23.3-2ubuntu3"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "cadaver",
"purl": "pkg:deb/ubuntu/cadaver@0.23.3-2ubuntu3?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.23.3-2ubuntu3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcoin80-runtime",
"binary_version": "3.1.4~abc9f50+dfsg3-2ubuntu0.1~esm1"
},
{
"binary_name": "libcoin80v5",
"binary_version": "3.1.4~abc9f50+dfsg3-2ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "coin3",
"purl": "pkg:deb/ubuntu/coin3@3.1.4~abc9f50+dfsg3-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.4~abc9f50+dfsg1-2",
"3.1.4~abc9f50+dfsg2-1",
"3.1.4~abc9f50+dfsg3-1",
"3.1.4~abc9f50+dfsg3-2",
"3.1.4~abc9f50+dfsg3-2ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libxmltok1",
"binary_version": "1.2-4ubuntu0.18.04.1~esm4"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "libxmltok",
"purl": "pkg:deb/ubuntu/libxmltok@1.2-4ubuntu0.18.04.1~esm4?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2-4ubuntu0.18.04.1~esm4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2-4",
"1.2-4ubuntu0.18.04.1~esm1",
"1.2-4ubuntu0.18.04.1~esm2",
"1.2-4ubuntu0.18.04.1~esm3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "matanza",
"binary_version": "0.13+ds1-6"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "matanza",
"purl": "pkg:deb/ubuntu/matanza@0.13+ds1-6?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.13+ds1-5build1",
"0.13+ds1-6"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "swish-e",
"binary_version": "2.4.7-5ubuntu1+esm1"
}
]
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"details": "In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).",
"id": "UBUNTU-CVE-2018-20843",
"modified": "2026-05-28T04:03:09Z",
"published": "2019-06-24T00:00:00Z",
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"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2018-20843"
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{
"type": "REPORT",
"url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226"
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{
"type": "REPORT",
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"type": "REPORT",
"url": "https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4040-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4040-2"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5455-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4852-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2018-20843"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-7199-1"
}
],
"related": [
"USN-4040-1",
"USN-4040-2",
"USN-5455-1",
"USN-4852-1",
"USN-7199-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2018-20843"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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