ubuntu-cve-2019-10691
Vulnerability from osv_ubuntu
Published
2019-04-18 09:00
Modified
2025-07-16 04:54
Summary
Details
The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.
Severity
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "dovecot-core",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-core-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-dbg",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-dev",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-dev-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-gssapi",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-gssapi-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-imapd",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-imapd-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-ldap",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-ldap-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-lmtpd",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-lmtpd-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-managesieved",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-managesieved-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-mysql",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-mysql-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-pgsql",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-pgsql-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-pop3d",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-pop3d-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-sieve",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-sieve-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-solr",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-solr-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-sqlite",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "dovecot-sqlite-dbgsym",
"binary_version": "1:2.2.9-1ubuntu2.6"
},
{
"binary_name": "mail-stack-delivery",
"binary_version": "1:2.2.9-1ubuntu2.6"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "dovecot",
"purl": "pkg:deb/ubuntu/dovecot@1:2.2.9-1ubuntu2.6?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.2.9-1ubuntu2.6"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:2.1.7-7ubuntu3",
"1:2.2.9-1ubuntu1",
"1:2.2.9-1ubuntu2",
"1:2.2.9-1ubuntu2.1",
"1:2.2.9-1ubuntu2.3",
"1:2.2.9-1ubuntu2.4",
"1:2.2.9-1ubuntu2.5"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "dovecot-core",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-core-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-dbg",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-dev",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-dev-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-gssapi",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-gssapi-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-imapd",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-imapd-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-ldap",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-ldap-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-lmtpd",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-lmtpd-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-lucene",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-lucene-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-managesieved",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-managesieved-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-mysql",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-mysql-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-pgsql",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-pgsql-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-pop3d",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-pop3d-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-sieve",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-sieve-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-solr",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-solr-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-sqlite",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "dovecot-sqlite-dbgsym",
"binary_version": "1:2.2.22-1ubuntu2.10"
},
{
"binary_name": "mail-stack-delivery",
"binary_version": "1:2.2.22-1ubuntu2.10"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "dovecot",
"purl": "pkg:deb/ubuntu/dovecot@1:2.2.22-1ubuntu2.10?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.2.22-1ubuntu2.10"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:2.2.18-2ubuntu2",
"1:2.2.22-1ubuntu1",
"1:2.2.22-1ubuntu2",
"1:2.2.22-1ubuntu2.1",
"1:2.2.22-1ubuntu2.2",
"1:2.2.22-1ubuntu2.3",
"1:2.2.22-1ubuntu2.4",
"1:2.2.22-1ubuntu2.6",
"1:2.2.22-1ubuntu2.7",
"1:2.2.22-1ubuntu2.8",
"1:2.2.22-1ubuntu2.9"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "dovecot-core",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-core-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-dev",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-gssapi",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-gssapi-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-imapd",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-imapd-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-ldap",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-ldap-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-lmtpd",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-lmtpd-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-managesieved",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-managesieved-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-mysql",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-mysql-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-pgsql",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-pgsql-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-pop3d",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-pop3d-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-sieve",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-sieve-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-solr",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-solr-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-sqlite",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "dovecot-sqlite-dbgsym",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
},
{
"binary_name": "mail-stack-delivery",
"binary_version": "1:2.2.33.2-1ubuntu4.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "dovecot",
"purl": "pkg:deb/ubuntu/dovecot@1:2.2.33.2-1ubuntu4.3?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.2.33.2-1ubuntu4.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:2.2.27-3ubuntu1",
"1:2.2.33.2-1ubuntu1",
"1:2.2.33.2-1ubuntu2",
"1:2.2.33.2-1ubuntu3",
"1:2.2.33.2-1ubuntu4",
"1:2.2.33.2-1ubuntu4.1",
"1:2.2.33.2-1ubuntu4.2"
]
}
],
"aliases": [],
"details": "The JSON encoder in Dovecot before 2.3.5.2 allows attackers to repeatedly crash the authentication service by attempting to authenticate with an invalid UTF-8 sequence as the username.",
"id": "UBUNTU-CVE-2019-10691",
"modified": "2025-07-16T04:54:34Z",
"published": "2019-04-18T09:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2019-10691"
},
{
"type": "REPORT",
"url": "https://dovecot.org/list/dovecot-news/2019-April/000406.html"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-3951-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-10691"
}
],
"related": [
"USN-3951-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2019-10691"
],
"withdrawn": "2025-07-18T16:45:06Z"
}
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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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