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USN-4993-1 (UBUNTU-CVE-2021-29157)
Vulnerability from osv_ubuntu – Published: 2021-06-21 13:50 – Updated: 2026-04-22 07:36 – Source website
VLAI
Summary
dovecot vulnerabilities
Details
Kirin discovered that Dovecot incorrectly escaped kid and azp fields in JWT tokens. A local attacker could possibly use this issue to validate tokens using arbitrary keys. This issue only affected Ubuntu 20.10 and Ubuntu 21.04. (CVE-2021-29157)
Fabian Ising and Damian Poddebniak discovered that Dovecot incorrectly handled STARTTLS when using the SMTP submission service. A remote attacker could possibly use this issue to inject plaintext commands before STARTTLS negotiation. (CVE-2021-33515)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2021-33515",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "dovecot-auth-lua",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-core",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-gssapi",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-imapd",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-ldap",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-lmtpd",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-lucene",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-managesieved",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-mysql",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-pgsql",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-pop3d",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-sieve",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-solr",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-sqlite",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "dovecot-submissiond",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
},
{
"binary_name": "mail-stack-delivery",
"binary_version": "1:2.3.7.2-1ubuntu3.4"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "dovecot",
"purl": "pkg:deb/ubuntu/dovecot@1:2.3.7.2-1ubuntu3.4?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:2.3.7.2-1ubuntu3.4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:2.3.4.1-5ubuntu3",
"1:2.3.7.2-1ubuntu1",
"1:2.3.7.2-1ubuntu2",
"1:2.3.7.2-1ubuntu3",
"1:2.3.7.2-1ubuntu3.1",
"1:2.3.7.2-1ubuntu3.2",
"1:2.3.7.2-1ubuntu3.3"
]
}
],
"aliases": [],
"details": "Kirin discovered that Dovecot incorrectly escaped kid and azp fields in JWT\ntokens. A local attacker could possibly use this issue to validate tokens\nusing arbitrary keys. This issue only affected Ubuntu 20.10 and Ubuntu\n21.04. (CVE-2021-29157)\n\nFabian Ising and Damian Poddebniak discovered that Dovecot incorrectly\nhandled STARTTLS when using the SMTP submission service. A remote attacker\ncould possibly use this issue to inject plaintext commands before\nSTARTTLS negotiation. (CVE-2021-33515)\n",
"id": "USN-4993-1",
"modified": "2026-04-22T07:36:59Z",
"published": "2021-06-21T13:50:48Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4993-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-29157"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-33515"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "dovecot vulnerabilities",
"upstream": [
"UBUNTU-CVE-2021-29157",
"UBUNTU-CVE-2021-33515"
]
}