ubuntu-cve-2021-38084
Vulnerability from osv_ubuntu
Published
2021-08-03 22:15
Modified
2026-05-20 14:53
Summary
Details
An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.
Severity
8.1 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "courier-base",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "courier-faxmail",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "courier-imap",
"binary_version": "4.10.0-20120615-1ubuntu7"
},
{
"binary_name": "courier-imap-ssl",
"binary_version": "4.10.0-20120615-1ubuntu7"
},
{
"binary_name": "courier-ldap",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "courier-maildrop",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "courier-mlm",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "courier-mta",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "courier-mta-ssl",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "courier-pcp",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "courier-pop",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "courier-pop-ssl",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "courier-ssl",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "courier-webadmin",
"binary_version": "0.68.2-1ubuntu7"
},
{
"binary_name": "sqwebmail",
"binary_version": "0.68.2-1ubuntu7"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "courier",
"purl": "pkg:deb/ubuntu/courier@0.68.2-1ubuntu7?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.68.2-1ubuntu5",
"0.68.2-1ubuntu6",
"0.68.2-1ubuntu7"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "courier-base",
"binary_version": "0.78.0-2ubuntu2"
},
{
"binary_name": "courier-faxmail",
"binary_version": "0.78.0-2ubuntu2"
},
{
"binary_name": "courier-imap",
"binary_version": "4.18.1+0.78.0-2ubuntu2"
},
{
"binary_name": "courier-imap-ssl",
"binary_version": "4.18.1+0.78.0-2ubuntu2"
},
{
"binary_name": "courier-ldap",
"binary_version": "0.78.0-2ubuntu2"
},
{
"binary_name": "courier-maildrop",
"binary_version": "2.9.1+0.78.0-2ubuntu2"
},
{
"binary_name": "courier-mlm",
"binary_version": "0.78.0-2ubuntu2"
},
{
"binary_name": "courier-mta",
"binary_version": "0.78.0-2ubuntu2"
},
{
"binary_name": "courier-mta-ssl",
"binary_version": "0.78.0-2ubuntu2"
},
{
"binary_name": "courier-pcp",
"binary_version": "0.78.0-2ubuntu2"
},
{
"binary_name": "courier-pop",
"binary_version": "0.78.0-2ubuntu2"
},
{
"binary_name": "courier-pop-ssl",
"binary_version": "0.78.0-2ubuntu2"
},
{
"binary_name": "courier-ssl",
"binary_version": "0.78.0-2ubuntu2"
},
{
"binary_name": "courier-webadmin",
"binary_version": "0.78.0-2ubuntu2"
},
{
"binary_name": "sqwebmail",
"binary_version": "5.9.0+0.78.0-2ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "courier",
"purl": "pkg:deb/ubuntu/courier@0.78.0-2ubuntu2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.78.0-2",
"0.78.0-2ubuntu1",
"0.78.0-2ubuntu2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "courier-base",
"binary_version": "1.0.6-1build2"
},
{
"binary_name": "courier-faxmail",
"binary_version": "1.0.6-1build2"
},
{
"binary_name": "courier-imap",
"binary_version": "5.0.6+1.0.6-1build2"
},
{
"binary_name": "courier-ldap",
"binary_version": "1.0.6-1build2"
},
{
"binary_name": "courier-mlm",
"binary_version": "1.0.6-1build2"
},
{
"binary_name": "courier-mta",
"binary_version": "1.0.6-1build2"
},
{
"binary_name": "courier-pcp",
"binary_version": "1.0.6-1build2"
},
{
"binary_name": "courier-pop",
"binary_version": "1.0.6-1build2"
},
{
"binary_name": "courier-webadmin",
"binary_version": "1.0.6-1build2"
},
{
"binary_name": "sqwebmail",
"binary_version": "6.0.0+1.0.6-1build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "courier",
"purl": "pkg:deb/ubuntu/courier@1.0.6-1build2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.6-1build1",
"1.0.6-1build2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "courier-base",
"binary_version": "1.0.16-3build3"
},
{
"binary_name": "courier-faxmail",
"binary_version": "1.0.16-3build3"
},
{
"binary_name": "courier-imap",
"binary_version": "5.0.13+1.0.16-3build3"
},
{
"binary_name": "courier-ldap",
"binary_version": "1.0.16-3build3"
},
{
"binary_name": "courier-mlm",
"binary_version": "1.0.16-3build3"
},
{
"binary_name": "courier-mta",
"binary_version": "1.0.16-3build3"
},
{
"binary_name": "courier-pcp",
"binary_version": "1.0.16-3build3"
},
{
"binary_name": "courier-pop",
"binary_version": "1.0.16-3build3"
},
{
"binary_name": "courier-webadmin",
"binary_version": "1.0.16-3build3"
},
{
"binary_name": "sqwebmail",
"binary_version": "6.0.5+1.0.16-3build3"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "courier",
"purl": "pkg:deb/ubuntu/courier@1.0.16-3build3?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.16-3build1",
"1.0.16-3build2",
"1.0.16-3build3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "courier-base",
"binary_version": "1.4.1-3"
},
{
"binary_name": "courier-faxmail",
"binary_version": "1.4.1-3"
},
{
"binary_name": "courier-imap",
"binary_version": "5.2.11+1.4.1-3"
},
{
"binary_name": "courier-ldap",
"binary_version": "1.4.1-3"
},
{
"binary_name": "courier-mlm",
"binary_version": "1.4.1-3"
},
{
"binary_name": "courier-mta",
"binary_version": "1.4.1-3"
},
{
"binary_name": "courier-pcp",
"binary_version": "1.4.1-3"
},
{
"binary_name": "courier-pop",
"binary_version": "1.4.1-3"
},
{
"binary_name": "courier-webadmin",
"binary_version": "1.4.1-3"
},
{
"binary_name": "sqwebmail",
"binary_version": "6.2.9+1.4.1-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "courier",
"purl": "pkg:deb/ubuntu/courier@1.4.1-3?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.13-11",
"1.4.1-1",
"1.4.1-2",
"1.4.1-2build1",
"1.4.1-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "courier-base",
"binary_version": "1.5.1-2"
},
{
"binary_name": "courier-faxmail",
"binary_version": "1.5.1-2"
},
{
"binary_name": "courier-imap",
"binary_version": "5.3.1+1.5.1-2"
},
{
"binary_name": "courier-ldap",
"binary_version": "1.5.1-2"
},
{
"binary_name": "courier-mlm",
"binary_version": "1.5.1-2"
},
{
"binary_name": "courier-mta",
"binary_version": "1.5.1-2"
},
{
"binary_name": "courier-pcp",
"binary_version": "1.5.1-2"
},
{
"binary_name": "courier-pop",
"binary_version": "1.5.1-2"
},
{
"binary_name": "courier-webadmin",
"binary_version": "1.5.1-2"
},
{
"binary_name": "sqwebmail",
"binary_version": "6.3.1+1.5.1-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "courier",
"purl": "pkg:deb/ubuntu/courier@1.5.1-2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.1-3",
"1.4.1-10",
"1.5.1-2"
]
}
],
"aliases": [],
"details": "An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.",
"id": "UBUNTU-CVE-2021-38084",
"modified": "2026-05-20T14:53:27Z",
"published": "2021-08-03T22:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-38084"
},
{
"type": "REPORT",
"url": "https://sourceforge.net/p/courier/mailman/courier-imap/thread/cone.1382574216.483027.8082.1000%40monster.email-scan.com/#msg31555583"
},
{
"type": "REPORT",
"url": "https://sourceforge.net/p/courier/mailman/message/37329216/"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-38084"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-38084"
]
}
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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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