CriticalFix available
etcd — security advisory
Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug function.
- Products
- etcd
- Affected versions
- 2.2.0+dfsg-2, 2.2.1+dfsg-1, 2.2.2+dfsg-1, 2.2.2+dfsg-2, 2.2.3+dfsg-1, 2.2.5+dfsg-1, 2.2.5+dfsg-1ubuntu1, 3.1.0-1, 3.2.17+dfsg-1, 3.2.17+dfsg-1ubuntu0.1, 3.2.17+dfsg-1ubuntu0.1+esm1, 3.2.17+dfsg-1ubuntu0.1~esm1, 3.2.26+dfsg-3, 3.2.26+dfsg-4, 3.2.26+dfsg-6, 3.2.26+dfsg-6ubuntu0.1, 3.2.26+dfsg-6ubuntu0.2, 3.2.9+dfsg-2, 3.2.9+dfsg-3, 3.3.25+dfsg-6, 3.3.25+dfsg-7, 3.3.25+dfsg-7ubuntu0.22.04.1, 3.4.23-4ubuntu2, 3.4.30-1, 3.4.30-1build1, 3.4.30-1ubuntu0.24.04.1, 3.4.30-1ubuntu0.24.04.2, 3.4.30-1ubuntu0.24.04.2+esm1, 3.4.30-1ubuntu0.24.04.3, 3.4.30-1ubuntu0.24.04.3+esm1, 3.4.30-1ubuntu0.24.04.3+esm2, 3.5.16-10, 3.5.16-10ubuntu0.26.04.1~esm1, 3.5.16-4, 3.5.30-2
- Fixed versions
- 3.2.17+dfsg-1ubuntu0.1+esm2, 3.2.26+dfsg-6ubuntu0.2+esm1, 3.3.25+dfsg-7ubuntu0.22.04.1+esm1
- CVEs
- CVE-2021-28235
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:52 UTC · Revision 1
Source evidence
Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug function.
osv:UBUNTU-CVE-2021-28235
etcd
Fixed versions: Not specified
etcd
Fixed versions: 3.2.17+dfsg-1ubuntu0.1+esm2
etcd
Fixed versions: 3.2.26+dfsg-6ubuntu0.2+esm1
etcd
Fixed versions: 3.3.25+dfsg-7ubuntu0.22.04.1+esm1
etcd
Fixed versions: Not specified
etcd
Fixed versions: Not specified
etcd
Fixed versions: Not specified
etcd
Fixed versions: Not specified
Complete source record
{
"id": "198fe3befc8afa4293b924c4c0609b5026112ad1c88b655587f51545c4e10d48",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-28235",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2021-28235",
"summary": "Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug function.",
"evidence": "osv:UBUNTU-CVE-2021-28235",
"products": [
{
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"affected_versions": [
{
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{
"value": "3.2.26+dfsg-4",
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{
"value": "3.2.26+dfsg-6",
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{
"value": "3.2.26+dfsg-6ubuntu0.1",
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{
"value": "3.2.26+dfsg-6ubuntu0.2",
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]
},
{
"name": {
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{
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],
"affected_versions": [
{
"value": "3.3.25+dfsg-6",
"evidence": "/affected/3/versions"
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{
"value": "3.3.25+dfsg-7",
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{
"value": "3.3.25+dfsg-7ubuntu0.22.04.1",
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]
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "3.4.23-4ubuntu2",
"evidence": "/affected/4/versions"
},
{
"value": "3.4.30-1",
"evidence": "/affected/4/versions"
},
{
"value": "3.4.30-1build1",
"evidence": "/affected/4/versions"
},
{
"value": "3.4.30-1ubuntu0.24.04.1",
"evidence": "/affected/4/versions"
},
{
"value": "3.4.30-1ubuntu0.24.04.2",
"evidence": "/affected/4/versions"
},
{
"value": "3.4.30-1ubuntu0.24.04.2+esm1",
"evidence": "/affected/4/versions"
},
{
"value": "3.4.30-1ubuntu0.24.04.3",
"evidence": "/affected/4/versions"
},
{
"value": "3.4.30-1ubuntu0.24.04.3+esm1",
"evidence": "/affected/4/versions"
},
{
"value": "3.4.30-1ubuntu0.24.04.3+esm2",
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},
{
"name": {
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{
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{
"name": {
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{
"value": "3.5.16-10",
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{
"value": "3.5.30-2",
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},
{
"name": {
"value": "etcd",
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},
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"affected_versions": [
{
"value": "3.5.16-4",
"evidence": "/affected/7/versions"
},
{
"value": "3.5.16-10",
"evidence": "/affected/7/versions"
},
{
"value": "3.5.16-10ubuntu0.26.04.1~esm1",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2021-28235",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
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"affected": [
{
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"2.2.1+dfsg-1",
"2.2.2+dfsg-1",
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"2.2.3+dfsg-1",
"2.2.5+dfsg-1",
"2.2.5+dfsg-1ubuntu1"
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},
"ecosystem_specific": {
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{
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{
"binary_name": "golang-etcd-server-dev",
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}
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}
},
{
"ranges": [
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],
"package": {
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},
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"3.2.9+dfsg-2",
"3.2.9+dfsg-3",
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"3.2.17+dfsg-1ubuntu0.1~esm1",
"3.2.17+dfsg-1ubuntu0.1",
"3.2.17+dfsg-1ubuntu0.1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28235.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "etcd-client",
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},
{
"binary_name": "etcd-server",
"binary_version": "3.2.17+dfsg-1ubuntu0.1+esm2"
},
{
"binary_name": "golang-etcd-server-dev",
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],
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}
},
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"ranges": [
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],
"package": {
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{
"binary_name": "etcd-server",
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{
"binary_name": "golang-etcd-server-dev",
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],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
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{
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"package": {
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},
"ecosystem_specific": {
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{
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{
"binary_name": "etcd-client",
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},
{
"binary_name": "etcd-server",
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{
"binary_name": "golang-etcd-server-dev",
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],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
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],
"package": {
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"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"3.4.23-4ubuntu2",
"3.4.30-1",
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"3.4.30-1ubuntu0.24.04.2",
"3.4.30-1ubuntu0.24.04.2+esm1",
"3.4.30-1ubuntu0.24.04.3",
"3.4.30-1ubuntu0.24.04.3+esm1",
"3.4.30-1ubuntu0.24.04.3+esm2"
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"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28235.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "etcd-client",
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{
"binary_name": "etcd-server",
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{
"binary_name": "golang-etcd-server-dev",
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}
},
{
"ranges": [
{
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{
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"package": {
"name": "etcd",
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"ecosystem": "Ubuntu:25.10"
},
"versions": [
"3.5.16-4"
],
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28235.json"
},
"ecosystem_specific": {
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{
"binary_name": "etcd-client",
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{
"binary_name": "etcd-server",
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{
"binary_name": "golang-etcd-server-dev",
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}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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"introduced": "0"
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],
"package": {
"name": "etcd",
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},
"versions": [
"3.5.16-10",
"3.5.30-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28235.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "etcd-client",
"binary_version": "3.5.30-2"
},
{
"binary_name": "etcd-server",
"binary_version": "3.5.30-2"
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{
"binary_name": "golang-etcd-server-dev",
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]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
"introduced": "0"
}
]
}
],
"package": {
"name": "etcd",
"purl": "pkg:deb/ubuntu/etcd?arch=source&distro=esm-apps%2Fresolute",
"ecosystem": "Ubuntu:Pro:26.04:LTS"
},
"versions": [
"3.5.16-4",
"3.5.16-10",
"3.5.16-10ubuntu0.26.04.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-28235.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "etcd-client",
"binary_version": "3.5.16-10ubuntu0.26.04.1~esm1"
},
{
"binary_name": "etcd-server",
"binary_version": "3.5.16-10ubuntu0.26.04.1~esm1"
},
{
"binary_name": "golang-etcd-server-dev",
"binary_version": "3.5.16-10ubuntu0.26.04.1~esm1"
}
]
}
}
],
"modified": "2026-10-17T12:56:14.755652775Z",
"provider": "osv",
"upstream": [
"CVE-2021-28235"
],
"references": [
"https://ubuntu.com/security/CVE-2021-28235",
"https://github.com/etcd-io/etcd/pull/15648",
"https://github.com/etcd-io/etcd/pull/15655",
"https://github.com/etcd-io/etcd/commit/1f746597ea6ce9f0a4554108bc853f256e150b0b",
"https://github.com/etcd-io/etcd/commit/3618ab4b07cc9c0883b6a642da198877e25d612b",
"https://ubuntu.com/security/notices/USN-6189-1",
"https://www.cve.org/CVERecord?id=CVE-2021-28235"
]
},
"related_cves": [
{
"value": "CVE-2021-28235",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 355018,
"published_at": "2023-04-04T15:15:00+00:00"
}