MediumFix available
mutt, neomutt — security advisory
Mutt before 1.14.4 and NeoMutt before 2020-06-19 have a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a "begin TLS" response, the client reads additional data (e.g., from a man-in-the-middle attacker) and evaluates it in a TLS context, aka "response injection."
- Products
- mutt, neomutt
- Affected versions
- Not specified
- Fixed versions
- 1.14.4-1, 20200619+dfsg.1-1
- CVEs
- CVE-2020-14954
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:41 UTC · Revision 1
Source evidence
Mutt before 1.14.4 and NeoMutt before 2020-06-19 have a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a "begin TLS" response, the client reads additional data (e.g., from a man-in-the-middle attacker) and evaluates it in a TLS context, aka "response injection."
osv:DEBIAN-CVE-2020-14954
mutt
Fixed versions: 1.14.4-1
mutt
Fixed versions: 1.14.4-1
mutt
Fixed versions: 1.14.4-1
neomutt
Fixed versions: 20200619+dfsg.1-1
neomutt
Fixed versions: 20200619+dfsg.1-1
neomutt
Fixed versions: 20200619+dfsg.1-1
Complete source record
{
"id": "7ee2014d24f69138002f5ec3d5eddbadd50323394465146ddd5157a0b0207491",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2020-14954",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2020-14954",
"summary": "Mutt before 1.14.4 and NeoMutt before 2020-06-19 have a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a \"begin TLS\" response, the client reads additional data (e.g., from a man-in-the-middle attacker) and evaluates it in a TLS context, aka \"response injection.\"",
"evidence": "osv:DEBIAN-CVE-2020-14954",
"products": [
{
"name": {
"value": "mutt",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.14.4-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "mutt",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.14.4-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "mutt",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.14.4-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "neomutt",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "20200619+dfsg.1-1",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "neomutt",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "20200619+dfsg.1-1",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "neomutt",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "20200619+dfsg.1-1",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2020-14954",
"aliases": [
"DEBIAN-CVE-2020-14954"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.14.4-1"
}
]
}
],
"package": {
"name": "mutt",
"purl": "pkg:deb/debian/mutt?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-14954.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.14.4-1"
}
]
}
],
"package": {
"name": "mutt",
"purl": "pkg:deb/debian/mutt?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-14954.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.14.4-1"
}
]
}
],
"package": {
"name": "mutt",
"purl": "pkg:deb/debian/mutt?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-14954.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "20200619+dfsg.1-1"
}
]
}
],
"package": {
"name": "neomutt",
"purl": "pkg:deb/debian/neomutt?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-14954.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "20200619+dfsg.1-1"
}
]
}
],
"package": {
"name": "neomutt",
"purl": "pkg:deb/debian/neomutt?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-14954.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "20200619+dfsg.1-1"
}
]
}
],
"package": {
"name": "neomutt",
"purl": "pkg:deb/debian/neomutt?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-14954.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T12:00:41.802200319Z",
"provider": "osv",
"upstream": [
"CVE-2020-14954"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2020-14954"
]
},
"related_cves": [
{
"value": "CVE-2020-14954",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 451273,
"published_at": "2020-06-21T17:15:09.603+00:00"
}