MediumFix available
avahi — security advisory
A flaw was found in avahi 0.8-5. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability.
- Products
- avahi
- Affected versions
- Not specified
- Fixed versions
- 0.8-r5
- CVEs
- CVE-2021-3502
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:05 UTC · Revision 1
Source evidence
A flaw was found in avahi 0.8-5. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability.
osv:ALPINE-CVE-2021-3502
avahi
Fixed versions: 0.8-r5
avahi
Fixed versions: 0.8-r5
avahi
Fixed versions: 0.8-r5
avahi
Fixed versions: 0.8-r5
avahi
Fixed versions: 0.8-r5
avahi
Fixed versions: 0.8-r5
avahi
Fixed versions: 0.8-r5
Complete source record
{
"id": "6700d8e5aca759b7a6a2bd2abb9a234597de8f3bf1ce1d248183608d3105b3a9",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2021-3502",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2021-3502",
"summary": "A flaw was found in avahi 0.8-5. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability.",
"evidence": "osv:ALPINE-CVE-2021-3502",
"products": [
{
"name": {
"value": "avahi",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.8-r5",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "avahi",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
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},
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"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
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"evidence": "/affected/3/package/name"
},
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{
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"evidence": "/affected/3/ranges"
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{
"name": {
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"evidence": "/affected/4/package/name"
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}
],
"affected_versions": []
},
{
"name": {
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},
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"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "ALPINE-CVE-2021-3502",
"aliases": [
"ALPINE-CVE-2021-3502"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
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{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
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{
"fixed": "0.8-r5"
}
]
}
],
"package": {
"name": "avahi",
"purl": "pkg:apk/alpine/avahi?arch=source",
"ecosystem": "Alpine:v3.18"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3502.json"
},
"ecosystem_specific": {}
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{
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],
"package": {
"name": "avahi",
"purl": "pkg:apk/alpine/avahi?arch=source",
"ecosystem": "Alpine:v3.19"
},
"database_specific": {
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{
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"package": {
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"purl": "pkg:apk/alpine/avahi?arch=source",
"ecosystem": "Alpine:v3.20"
},
"database_specific": {
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"package": {
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"purl": "pkg:apk/alpine/avahi?arch=source",
"ecosystem": "Alpine:v3.21"
},
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"package": {
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"purl": "pkg:apk/alpine/avahi?arch=source",
"ecosystem": "Alpine:v3.22"
},
"database_specific": {
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},
"ecosystem_specific": {}
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{
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],
"package": {
"name": "avahi",
"purl": "pkg:apk/alpine/avahi?arch=source",
"ecosystem": "Alpine:v3.23"
},
"database_specific": {
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},
"ecosystem_specific": {}
},
{
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],
"package": {
"name": "avahi",
"purl": "pkg:apk/alpine/avahi?arch=source",
"ecosystem": "Alpine:v3.24"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-3502.json"
},
"ecosystem_specific": {}
}
],
"modified": "2026-10-23T17:17:56.195899545Z",
"provider": "osv",
"upstream": [
"CVE-2021-3502"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2021-3502"
]
},
"related_cves": [
{
"value": "CVE-2021-3502",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 415477,
"published_at": "2021-05-07T12:15:07.267+00:00"
}