ubuntu-cve-2021-27216
Vulnerability from osv_ubuntu
Published
2021-05-04 13:30
Modified
2026-04-22 07:39
Summary
Details
Exim 4 before 4.94.2 has Execution with Unnecessary Privileges. By leveraging a delete_pid_file race condition, a local user can delete arbitrary files as root. This involves the -oP and -oPX options.
Severity
6.3 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "exim4",
"binary_version": "4.82-3ubuntu2.4+esm3"
},
{
"binary_name": "exim4-base",
"binary_version": "4.82-3ubuntu2.4+esm3"
},
{
"binary_name": "exim4-config",
"binary_version": "4.82-3ubuntu2.4+esm3"
},
{
"binary_name": "exim4-daemon-heavy",
"binary_version": "4.82-3ubuntu2.4+esm3"
},
{
"binary_name": "exim4-daemon-light",
"binary_version": "4.82-3ubuntu2.4+esm3"
},
{
"binary_name": "eximon4",
"binary_version": "4.82-3ubuntu2.4+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "exim4",
"purl": "pkg:deb/ubuntu/exim4@4.82-3ubuntu2.4+esm3?arch=source\u0026distro=trusty/esm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.82-3ubuntu2.4+esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.80-7ubuntu3",
"4.80-7ubuntu4",
"4.80-9ubuntu1",
"4.80-9ubuntu2",
"4.82-3ubuntu1",
"4.82-3ubuntu2",
"4.82-3ubuntu2.1",
"4.82-3ubuntu2.2",
"4.82-3ubuntu2.3",
"4.82-3ubuntu2.4",
"4.82-3ubuntu2.4+esm1",
"4.82-3ubuntu2.4+esm2"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "exim4",
"binary_version": "4.86.2-2ubuntu2.6+esm1"
},
{
"binary_name": "exim4-base",
"binary_version": "4.86.2-2ubuntu2.6+esm1"
},
{
"binary_name": "exim4-config",
"binary_version": "4.86.2-2ubuntu2.6+esm1"
},
{
"binary_name": "exim4-daemon-heavy",
"binary_version": "4.86.2-2ubuntu2.6+esm1"
},
{
"binary_name": "exim4-daemon-light",
"binary_version": "4.86.2-2ubuntu2.6+esm1"
},
{
"binary_name": "eximon4",
"binary_version": "4.86.2-2ubuntu2.6+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "exim4",
"purl": "pkg:deb/ubuntu/exim4@4.86.2-2ubuntu2.6+esm1?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.86.2-2ubuntu2.6+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.86-3ubuntu1",
"4.86-7ubuntu1",
"4.86-7ubuntu2",
"4.86-7ubuntu3",
"4.86.2-2ubuntu1",
"4.86.2-2ubuntu2",
"4.86.2-2ubuntu2.1",
"4.86.2-2ubuntu2.2",
"4.86.2-2ubuntu2.3",
"4.86.2-2ubuntu2.4",
"4.86.2-2ubuntu2.5",
"4.86.2-2ubuntu2.6"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "exim4",
"binary_version": "4.90.1-1ubuntu1.8"
},
{
"binary_name": "exim4-base",
"binary_version": "4.90.1-1ubuntu1.8"
},
{
"binary_name": "exim4-config",
"binary_version": "4.90.1-1ubuntu1.8"
},
{
"binary_name": "exim4-daemon-heavy",
"binary_version": "4.90.1-1ubuntu1.8"
},
{
"binary_name": "exim4-daemon-light",
"binary_version": "4.90.1-1ubuntu1.8"
},
{
"binary_name": "eximon4",
"binary_version": "4.90.1-1ubuntu1.8"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "exim4",
"purl": "pkg:deb/ubuntu/exim4@4.90.1-1ubuntu1.8?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.90.1-1ubuntu1.8"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.89-5ubuntu1",
"4.89-9ubuntu1",
"4.89-9ubuntu2",
"4.89-9ubuntu3",
"4.89-9ubuntu4",
"4.90.1-1ubuntu1",
"4.90.1-1ubuntu1.1",
"4.90.1-1ubuntu1.2",
"4.90.1-1ubuntu1.3",
"4.90.1-1ubuntu1.4",
"4.90.1-1ubuntu1.5"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "exim4",
"binary_version": "4.93-13ubuntu1.5"
},
{
"binary_name": "exim4-base",
"binary_version": "4.93-13ubuntu1.5"
},
{
"binary_name": "exim4-config",
"binary_version": "4.93-13ubuntu1.5"
},
{
"binary_name": "exim4-daemon-heavy",
"binary_version": "4.93-13ubuntu1.5"
},
{
"binary_name": "exim4-daemon-light",
"binary_version": "4.93-13ubuntu1.5"
},
{
"binary_name": "eximon4",
"binary_version": "4.93-13ubuntu1.5"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "exim4",
"purl": "pkg:deb/ubuntu/exim4@4.93-13ubuntu1.5?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.93-13ubuntu1.5"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.92.1-1ubuntu3",
"4.92.1-1ubuntu4",
"4.93~RC2-1ubuntu1",
"4.93-9ubuntu1",
"4.93-11ubuntu1",
"4.93-12ubuntu1",
"4.93-13ubuntu1",
"4.93-13ubuntu1.1"
]
}
],
"aliases": [],
"details": "Exim 4 before 4.94.2 has Execution with Unnecessary Privileges. By leveraging a delete_pid_file race condition, a local user can delete arbitrary files as root. This involves the -oP and -oPX options.",
"id": "UBUNTU-CVE-2021-27216",
"modified": "2026-04-22T07:39:57Z",
"published": "2021-05-04T13:30:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-27216"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4934-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4934-2"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-27216"
}
],
"related": [
"USN-4934-1",
"USN-4934-2"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-27216"
]
}
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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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