CriticalFix available
opensmtpd — security advisory
smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session, as demonstrated by shell metacharacters in a MAIL FROM field. This affects the "uncommented" default configuration. The issue exists because of an incorrect return value upon failure of input validation.
- Products
- opensmtpd
- Affected versions
- Not specified
- Fixed versions
- 6.6.2p1-r0
- CVEs
- CVE-2020-7247
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:12 UTC · Revision 1
Source evidence
smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session, as demonstrated by shell metacharacters in a MAIL FROM field. This affects the "uncommented" default configuration. The issue exists because of an incorrect return value upon failure of input validation.
osv:ALPINE-CVE-2020-7247
opensmtpd
Fixed versions: 6.6.2p1-r0
opensmtpd
Fixed versions: 6.6.2p1-r0
opensmtpd
Fixed versions: 6.6.2p1-r0
opensmtpd
Fixed versions: 6.6.2p1-r0
opensmtpd
Fixed versions: 6.6.2p1-r0
opensmtpd
Fixed versions: 6.6.2p1-r0
Complete source record
{
"id": "73fc0421bb5417aa6d3bc66bea055b7b8963edfea887a7dd82f7fd9341e8c2fc",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2020-7247",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2020-7247",
"summary": "smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session, as demonstrated by shell metacharacters in a MAIL FROM field. This affects the \"uncommented\" default configuration. The issue exists because of an incorrect return value upon failure of input validation.",
"evidence": "osv:ALPINE-CVE-2020-7247",
"products": [
{
"name": {
"value": "opensmtpd",
"evidence": "/affected/0/package/name"
},
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"fixed_versions": [
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"evidence": "/affected/0/ranges"
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{
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{
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{
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],
"severity": "critical",
"structured": {
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"aliases": [
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],
"metrics": [
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"type": "CVSS_V3",
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"affected": [
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"package": {
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"purl": "pkg:apk/alpine/opensmtpd?arch=source",
"ecosystem": "Alpine:v3.11"
},
"database_specific": {
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},
"database_specific": {
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{
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],
"package": {
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"purl": "pkg:apk/alpine/opensmtpd?arch=source",
"ecosystem": "Alpine:v3.13"
},
"database_specific": {
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"package": {
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"ecosystem": "Alpine:v3.15"
},
"database_specific": {
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{
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],
"package": {
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"purl": "pkg:apk/alpine/opensmtpd?arch=source",
"ecosystem": "Alpine:v3.16"
},
"database_specific": {
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},
"ecosystem_specific": {}
}
],
"modified": "2026-10-26T11:17:55.180411958Z",
"provider": "osv",
"upstream": [
"CVE-2020-7247"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2020-7247"
]
},
"related_cves": [
{
"value": "CVE-2020-7247",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450669,
"published_at": "2020-01-29T16:15:12.897+00:00"
}