MediumFix available
dovecot — security advisory
The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing > character exists. This causes a denial of service in which the recipient cannot read all of their messages.
- Products
- dovecot
- Affected versions
- Not specified
- Fixed versions
- 2.3.10.1-r0, 2.3.9.3-r0
- CVEs
- CVE-2020-7957
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:12 UTC · Revision 1
Source evidence
The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing > character exists. This causes a denial of service in which the recipient cannot read all of their messages.
osv:ALPINE-CVE-2020-7957
dovecot
Fixed versions: 2.3.10.1-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.9.3-r0
dovecot
Fixed versions: 2.3.10.1-r0
dovecot
Fixed versions: 2.3.10.1-r0
Complete source record
{
"id": "92b30588fe88b205bdf4b303459d201e40396049ff0a3be272d4c383c775eb21",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2020-7957",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2020-7957",
"summary": "The IMAP and LMTP components in Dovecot 2.3.9 before 2.3.9.3 mishandle snippet generation when many characters must be read to compute the snippet and a trailing > character exists. This causes a denial of service in which the recipient cannot read all of their messages.",
"evidence": "osv:ALPINE-CVE-2020-7957",
"products": [
{
"name": {
"value": "dovecot",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.3.10.1-r0",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.3.9.3-r0",
"evidence": "/affected/1/ranges"
}
],
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},
{
"name": {
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"evidence": "/affected/2/package/name"
},
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{
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"evidence": "/affected/2/ranges"
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],
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{
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{
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"evidence": "/affected/4/ranges"
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],
"affected_versions": []
},
{
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"evidence": "/affected/5/ranges"
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{
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{
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},
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"evidence": "/affected/7/ranges"
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],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/8/package/name"
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{
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"evidence": "/affected/8/ranges"
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"affected_versions": []
},
{
"name": {
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"evidence": "/affected/9/package/name"
},
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{
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"evidence": "/affected/9/ranges"
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],
"affected_versions": []
},
{
"name": {
"value": "dovecot",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.3.9.3-r0",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.3.9.3-r0",
"evidence": "/affected/11/ranges"
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],
"affected_versions": []
},
{
"name": {
"value": "dovecot",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.3.9.3-r0",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.3.9.3-r0",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.3.9.3-r0",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.3.10.1-r0",
"evidence": "/affected/15/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "dovecot",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.3.10.1-r0",
"evidence": "/affected/16/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "ALPINE-CVE-2020-7957",
"aliases": [
"ALPINE-CVE-2020-7957"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.3.9"
},
{
"fixed": "2.3.10.1-r0"
}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.10"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-7957.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.3.9"
},
{
"fixed": "2.3.9.3-r0"
}
]
}
],
"package": {
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"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.11"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-7957.json"
},
"ecosystem_specific": {}
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{
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{
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}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.12"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-7957.json"
},
"ecosystem_specific": {}
},
{
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{
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{
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}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.13"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-7957.json"
},
"ecosystem_specific": {}
},
{
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{
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"events": [
{
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{
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}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.14"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-7957.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
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"events": [
{
"introduced": "2.3.9"
},
{
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}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.15"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-7957.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "2.3.9.3-r0"
}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.16"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-7957.json"
},
"ecosystem_specific": {}
},
{
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{
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{
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]
}
],
"package": {
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},
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},
"ecosystem_specific": {}
},
{
"ranges": [
{
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"events": [
{
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},
{
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}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.18"
},
"database_specific": {
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},
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{
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],
"package": {
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{
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],
"package": {
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},
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},
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{
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],
"package": {
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"ecosystem": "Alpine:v3.21"
},
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},
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{
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]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
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},
"ecosystem_specific": {}
},
{
"ranges": [
{
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{
"introduced": "2.3.9"
},
{
"fixed": "2.3.9.3-r0"
}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-7957.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.3.9"
},
{
"fixed": "2.3.9.3-r0"
}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-7957.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.3.9"
},
{
"fixed": "2.3.10.1-r0"
}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.8"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-7957.json"
},
"ecosystem_specific": {}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "2.3.9"
},
{
"fixed": "2.3.10.1-r0"
}
]
}
],
"package": {
"name": "dovecot",
"purl": "pkg:apk/alpine/dovecot?arch=source",
"ecosystem": "Alpine:v3.9"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-7957.json"
},
"ecosystem_specific": {}
}
],
"modified": "2026-10-26T11:17:55.181291075Z",
"provider": "osv",
"upstream": [
"CVE-2020-7957"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2020-7957"
]
},
"related_cves": [
{
"value": "CVE-2020-7957",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450673,
"published_at": "2020-02-12T17:15:12.563+00:00"
}