ubuntu-cve-2020-10188
Vulnerability from osv_ubuntu
Published
2020-03-06 15:15
Modified
2026-05-20 14:52
Summary
Details
utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes or urgent data, because of a buffer overflow involving the netclear and nextitem functions.
Severity
9.8 (Critical)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "inetutils-ftp",
"binary_version": "2:1.9.2-1ubuntu0.1~esm2"
},
{
"binary_name": "inetutils-ftpd",
"binary_version": "2:1.9.2-1ubuntu0.1~esm2"
},
{
"binary_name": "inetutils-inetd",
"binary_version": "2:1.9.2-1ubuntu0.1~esm2"
},
{
"binary_name": "inetutils-ping",
"binary_version": "2:1.9.2-1ubuntu0.1~esm2"
},
{
"binary_name": "inetutils-syslogd",
"binary_version": "2:1.9.2-1ubuntu0.1~esm2"
},
{
"binary_name": "inetutils-talk",
"binary_version": "2:1.9.2-1ubuntu0.1~esm2"
},
{
"binary_name": "inetutils-talkd",
"binary_version": "2:1.9.2-1ubuntu0.1~esm2"
},
{
"binary_name": "inetutils-telnet",
"binary_version": "2:1.9.2-1ubuntu0.1~esm2"
},
{
"binary_name": "inetutils-telnetd",
"binary_version": "2:1.9.2-1ubuntu0.1~esm2"
},
{
"binary_name": "inetutils-tools",
"binary_version": "2:1.9.2-1ubuntu0.1~esm2"
},
{
"binary_name": "inetutils-traceroute",
"binary_version": "2:1.9.2-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "inetutils",
"purl": "pkg:deb/ubuntu/inetutils@2:1.9.2-1ubuntu0.1~esm2?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.9.2-1ubuntu0.1~esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:1.9.1.306-0a482-1",
"2:1.9.1.363-bbc1-1",
"2:1.9.2-1",
"2:1.9.2-1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "inetutils-ftp",
"binary_version": "2:1.9.4-1ubuntu0.1~esm1"
},
{
"binary_name": "inetutils-ftpd",
"binary_version": "2:1.9.4-1ubuntu0.1~esm1"
},
{
"binary_name": "inetutils-inetd",
"binary_version": "2:1.9.4-1ubuntu0.1~esm1"
},
{
"binary_name": "inetutils-ping",
"binary_version": "2:1.9.4-1ubuntu0.1~esm1"
},
{
"binary_name": "inetutils-syslogd",
"binary_version": "2:1.9.4-1ubuntu0.1~esm1"
},
{
"binary_name": "inetutils-talk",
"binary_version": "2:1.9.4-1ubuntu0.1~esm1"
},
{
"binary_name": "inetutils-talkd",
"binary_version": "2:1.9.4-1ubuntu0.1~esm1"
},
{
"binary_name": "inetutils-telnet",
"binary_version": "2:1.9.4-1ubuntu0.1~esm1"
},
{
"binary_name": "inetutils-telnetd",
"binary_version": "2:1.9.4-1ubuntu0.1~esm1"
},
{
"binary_name": "inetutils-tools",
"binary_version": "2:1.9.4-1ubuntu0.1~esm1"
},
{
"binary_name": "inetutils-traceroute",
"binary_version": "2:1.9.4-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "inetutils",
"purl": "pkg:deb/ubuntu/inetutils@2:1.9.4-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.9.4-1ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:1.9.4-1",
"2:1.9.4-1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "telnet-ssl",
"binary_version": "0.17.40+0.2-1"
},
{
"binary_name": "telnetd-ssl",
"binary_version": "0.17.40+0.2-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "netkit-telnet-ssl",
"purl": "pkg:deb/ubuntu/netkit-telnet-ssl@0.17.40+0.2-1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.17.40+0.2-1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "inetutils-ftp",
"binary_version": "2:1.9.4-3ubuntu0.1"
},
{
"binary_name": "inetutils-ftpd",
"binary_version": "2:1.9.4-3ubuntu0.1"
},
{
"binary_name": "inetutils-inetd",
"binary_version": "2:1.9.4-3ubuntu0.1"
},
{
"binary_name": "inetutils-ping",
"binary_version": "2:1.9.4-3ubuntu0.1"
},
{
"binary_name": "inetutils-syslogd",
"binary_version": "2:1.9.4-3ubuntu0.1"
},
{
"binary_name": "inetutils-talk",
"binary_version": "2:1.9.4-3ubuntu0.1"
},
{
"binary_name": "inetutils-talkd",
"binary_version": "2:1.9.4-3ubuntu0.1"
},
{
"binary_name": "inetutils-telnet",
"binary_version": "2:1.9.4-3ubuntu0.1"
},
{
"binary_name": "inetutils-telnetd",
"binary_version": "2:1.9.4-3ubuntu0.1"
},
{
"binary_name": "inetutils-tools",
"binary_version": "2:1.9.4-3ubuntu0.1"
},
{
"binary_name": "inetutils-traceroute",
"binary_version": "2:1.9.4-3ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "inetutils",
"purl": "pkg:deb/ubuntu/inetutils@2:1.9.4-3ubuntu0.1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.9.4-3ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:1.9.4-2build1",
"2:1.9.4-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "telnet-ssl",
"binary_version": "0.17.41+0.2-3build1"
},
{
"binary_name": "telnetd-ssl",
"binary_version": "0.17.41+0.2-3build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "netkit-telnet-ssl",
"purl": "pkg:deb/ubuntu/netkit-telnet-ssl@0.17.41+0.2-3build1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.17.41+0.2-3",
"0.17.41+0.2-3build1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "inetutils-ftp",
"binary_version": "2:1.9.4-11ubuntu0.1"
},
{
"binary_name": "inetutils-ftpd",
"binary_version": "2:1.9.4-11ubuntu0.1"
},
{
"binary_name": "inetutils-inetd",
"binary_version": "2:1.9.4-11ubuntu0.1"
},
{
"binary_name": "inetutils-ping",
"binary_version": "2:1.9.4-11ubuntu0.1"
},
{
"binary_name": "inetutils-syslogd",
"binary_version": "2:1.9.4-11ubuntu0.1"
},
{
"binary_name": "inetutils-talk",
"binary_version": "2:1.9.4-11ubuntu0.1"
},
{
"binary_name": "inetutils-talkd",
"binary_version": "2:1.9.4-11ubuntu0.1"
},
{
"binary_name": "inetutils-telnet",
"binary_version": "2:1.9.4-11ubuntu0.1"
},
{
"binary_name": "inetutils-telnetd",
"binary_version": "2:1.9.4-11ubuntu0.1"
},
{
"binary_name": "inetutils-tools",
"binary_version": "2:1.9.4-11ubuntu0.1"
},
{
"binary_name": "inetutils-traceroute",
"binary_version": "2:1.9.4-11ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "inetutils",
"purl": "pkg:deb/ubuntu/inetutils@2:1.9.4-11ubuntu0.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.9.4-11ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:1.9.4-10build1",
"2:1.9.4-11"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "telnet-ssl",
"binary_version": "0.17.41+0.2-3.2build1"
},
{
"binary_name": "telnetd-ssl",
"binary_version": "0.17.41+0.2-3.2build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "netkit-telnet-ssl",
"purl": "pkg:deb/ubuntu/netkit-telnet-ssl@0.17.41+0.2-3.2build1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.17.41+0.2-3.2",
"0.17.41+0.2-3.2build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "telnet-ssl",
"binary_version": "0.17.41+0.2-3.3build2"
},
{
"binary_name": "telnetd-ssl",
"binary_version": "0.17.41+0.2-3.3build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "netkit-telnet-ssl",
"purl": "pkg:deb/ubuntu/netkit-telnet-ssl@0.17.41+0.2-3.3build2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.17.41+0.2-3.3build1",
"0.17.41+0.2-3.3build2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "telnet-ssl",
"binary_version": "0.17.41+really0.17-4build2"
},
{
"binary_name": "telnetd-ssl",
"binary_version": "0.17.41+really0.17-4build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "netkit-telnet-ssl",
"purl": "pkg:deb/ubuntu/netkit-telnet-ssl@0.17.41+really0.17-4build2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.17.41+really0.17-4",
"0.17.41+really0.17-4build1",
"0.17.41+really0.17-4build2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "telnet-ssl",
"binary_version": "0.17.41+really0.17-6"
},
{
"binary_name": "telnetd-ssl",
"binary_version": "0.17.41+really0.17-6"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "netkit-telnet-ssl",
"purl": "pkg:deb/ubuntu/netkit-telnet-ssl@0.17.41+really0.17-6?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.17.41+really0.17-5",
"0.17.41+really0.17-6"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "telnet-ssl",
"binary_version": "0.17.41+really0.17-7"
},
{
"binary_name": "telnetd-ssl",
"binary_version": "0.17.41+really0.17-7"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "netkit-telnet-ssl",
"purl": "pkg:deb/ubuntu/netkit-telnet-ssl@0.17.41+really0.17-7?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.17.41+really0.17-6",
"0.17.41+really0.17-7"
]
}
],
"aliases": [],
"details": "utility.c in telnetd in netkit telnet through 0.17 allows remote attackers to execute arbitrary code via short writes or urgent data, because of a buffer overflow involving the netclear and nextitem functions.",
"id": "UBUNTU-CVE-2020-10188",
"modified": "2026-05-20T14:52:01Z",
"published": "2020-03-06T15:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2020-10188"
},
{
"type": "REPORT",
"url": "https://appgateresearch.blogspot.com/2020/02/bravestarr-fedora-31-netkit-telnetd_28.html"
},
{
"type": "REPORT",
"url": "https://github.com/krb5/krb5-appl/blob/d00cd671dfe945791b33d4f1f6a5c57ae1667ef8/telnet/telnetd/utility.c#L205-L216"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5048-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5048-2"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-10188"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-7781-1"
}
],
"related": [
"USN-5048-1",
"USN-5048-2",
"USN-7781-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2020-10188"
]
}
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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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