HighFix available
redict, redis and 1 more products — security advisory
Redis is an open source, in-memory database that persists on disk. In versions starting at 2.6 and prior to 7.4.3, An unauthenticated client can cause unlimited growth of output buffers, until the server runs out of memory or is killed. By default, the Redis configuration does not limit the output buffer of normal clients (see client-output-buffer-limit). Therefore, the output buffer can grow unlimitedly over time. As a result, the service is exhausted and the memory is unavailable. When password authentication is enabled on the Redis server, but no password is provided, the client can still cause the output buffer to grow from "NOAUTH" responses until the system will run out of memory. This issue has been patched in version 7.4.3. An additional workaround to mitigate this problem without patching the redis-server executable is to block access to prevent unauthenticated users from connecting to Redis. This can be done in different ways. Either using network access control tools like firewalls, iptables, security groups, etc, or enabling TLS and requiring users to authenticate using client side certificates.
- Products
- redict, redis, valkey
- Affected versions
- 2:2.6.13-1, 2:2.6.16-3, 2:2.8.0-1, 2:2.8.2-1, 2:2.8.4-2, 2:2.8.4-2ubuntu0.2, 2:2.8.4-2ubuntu0.2+esm1, 2:2.8.4-2ubuntu0.2+esm2, 2:2.8.4-2ubuntu0.2+esm3, 2:2.8.4-2ubuntu0.2+esm4, 2:2.8.4-2ubuntu0.2+esm5, 2:3.0.3-3, 2:3.0.5-1, 2:3.0.5-2, 2:3.0.5-3, 2:3.0.5-4, 2:3.0.6-1, 2:3.0.6-1ubuntu0.2, 2:3.0.6-1ubuntu0.3, 2:3.0.6-1ubuntu0.4, 2:3.0.6-1ubuntu0.4+esm1, 2:3.0.6-1ubuntu0.4+esm2, 2:3.0.6-1ubuntu0.4+esm3, 2:3.0.6-1ubuntu0.4+esm4, 2:3.0.6-1ubuntu0.4+esm5, 4:4.0.1-7, 4:4.0.2-6, 4:4.0.2-9, 5:4.0.5-1, 5:4.0.6-1, 5:4.0.6-2, 5:4.0.7-1, 5:4.0.8-1, 5:4.0.8-2, 5:4.0.9-1, 5:4.0.9-1ubuntu0.1, 5:4.0.9-1ubuntu0.2, 5:4.0.9-1ubuntu0.2+esm2, 5:4.0.9-1ubuntu0.2+esm3, 5:4.0.9-1ubuntu0.2+esm4, 5:4.0.9-1ubuntu0.2+esm5, 5:4.0.9-1ubuntu0.2+esm6, 5:4.0.9-1ubuntu0.2+esm7, 5:5.0.5-2build1, 5:5.0.6-1, 5:5.0.7-1, 5:5.0.7-2, 5:5.0.7-2ubuntu0.1, 5:5.0.7-2ubuntu0.1+esm1, 5:5.0.7-2ubuntu0.1+esm2, 5:5.0.7-2ubuntu0.1+esm3, 5:5.0.7-2ubuntu0.1+esm4, 5:5.0.7-2ubuntu0.1~esm1, 5:6.0.15-1, 5:6.0.16-1, 5:6.0.16-1build1, 5:6.0.16-1ubuntu1, 5:6.0.16-1ubuntu1+esm1, 5:6.0.16-1ubuntu1+esm2, 5:6.0.16-1ubuntu1.1, 5:6.0.16-1ubuntu1.1+esm1, 5:6.0.16-1ubuntu1.2, 5:6.0.16-1ubuntu1.2+esm1, 5:7.0.12-1, 5:7.0.14-1, 5:7.0.14-2, 5:7.0.15-1, 5:7.0.15-1build1, 5:7.0.15-1build2, 5:7.0.15-1ubuntu0.24.04.1, 5:7.0.15-1ubuntu0.24.04.2, 5:7.0.15-1ubuntu0.24.04.3, 5:7.0.15-1ubuntu0.24.04.4, 5:7.0.15-1ubuntu0.24.04.5, 7.2.10+dfsg1-0ubuntu0.1, 7.2.11+dfsg1-0ubuntu0.1, 7.2.5+dfsg1-2ubuntu4~24.04.1, 7.2.7+dfsg1-0ubuntu0.24.04.1, 7.2.8+dfsg1-0ubuntu0.24.04.1, 7.2.8+dfsg1-0ubuntu0.24.04.2, 7.2.8+dfsg1-0ubuntu0.24.04.3, 7.3.2+ds-1, 7.3.5+ds-1, 7.3.5+ds-1ubuntu0.1, 7.3.5+ds-1ubuntu0.2, 7.3.6+ds-1, 7.3.6+ds-2, 7.3.6+ds-2build1
- Fixed versions
- 7.2.11+dfsg1-0ubuntu0.2
- CVEs
- CVE-2025-21605
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:31 UTC · Revision 1
Source evidence
Redis is an open source, in-memory database that persists on disk. In versions starting at 2.6 and prior to 7.4.3, An unauthenticated client can cause unlimited growth of output buffers, until the server runs out of memory or is killed. By default, the Redis configuration does not limit the output buffer of normal clients (see client-output-buffer-limit). Therefore, the output buffer can grow unlimitedly over time. As a result, the service is exhausted and the memory is unavailable. When password authentication is enabled on the Redis server, but no password is provided, the client can still cause the output buffer to grow from "NOAUTH" responses until the system will run out of memory. This issue has been patched in version 7.4.3. An additional workaround to mitigate this problem without patching the redis-server executable is to block access to prevent unauthenticated users from connecting to Redis. This can be done in different ways. Either using network access control tools like firewalls, iptables, security groups, etc, or enabling TLS and requiring users to authenticate using client side certificates.
osv:UBUNTU-CVE-2025-21605
redis
Fixed versions: Not specified
redis
Fixed versions: Not specified
redis
Fixed versions: Not specified
redis
Fixed versions: Not specified
redis
Fixed versions: Not specified
redis
Fixed versions: Not specified
valkey
Fixed versions: 7.2.11+dfsg1-0ubuntu0.2
redict
Fixed versions: Not specified
redict
Fixed versions: Not specified
redict
Fixed versions: Not specified
Complete source record
{
"id": "ab8ad759afea5ae22aed20a4c5f01bae7d42cf94ea53a5f665e84e43ecf402c6",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-21605",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-21605",
"summary": "Redis is an open source, in-memory database that persists on disk. In versions starting at 2.6 and prior to 7.4.3, An unauthenticated client can cause unlimited growth of output buffers, until the server runs out of memory or is killed. By default, the Redis configuration does not limit the output buffer of normal clients (see client-output-buffer-limit). Therefore, the output buffer can grow unlimitedly over time. As a result, the service is exhausted and the memory is unavailable. When password authentication is enabled on the Redis server, but no password is provided, the client can still cause the output buffer to grow from \"NOAUTH\" responses until the system will run out of memory. This issue has been patched in version 7.4.3. An additional workaround to mitigate this problem without patching the redis-server executable is to block access to prevent unauthenticated users from connecting to Redis. This can be done in different ways. Either using network access control tools like firewalls, iptables, security groups, etc, or enabling TLS and requiring users to authenticate using client side certificates.",
"evidence": "osv:UBUNTU-CVE-2025-21605",
"products": [
{
"name": {
"value": "redis",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2:2.6.13-1",
"evidence": "/affected/0/versions"
},
{
"value": "2:2.6.16-3",
"evidence": "/affected/0/versions"
},
{
"value": "2:2.8.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2:2.8.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "2:2.8.4-2",
"evidence": "/affected/0/versions"
},
{
"value": "2:2.8.4-2ubuntu0.2",
"evidence": "/affected/0/versions"
},
{
"value": "2:2.8.4-2ubuntu0.2+esm1",
"evidence": "/affected/0/versions"
},
{
"value": "2:2.8.4-2ubuntu0.2+esm2",
"evidence": "/affected/0/versions"
},
{
"value": "2:2.8.4-2ubuntu0.2+esm3",
"evidence": "/affected/0/versions"
},
{
"value": "2:2.8.4-2ubuntu0.2+esm4",
"evidence": "/affected/0/versions"
},
{
"value": "2:2.8.4-2ubuntu0.2+esm5",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "redis",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2:3.0.3-3",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.5-1",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.5-2",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.5-3",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.5-4",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.6-1",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.6-1ubuntu0.2",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.6-1ubuntu0.3",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.6-1ubuntu0.4",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.6-1ubuntu0.4+esm1",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.6-1ubuntu0.4+esm2",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.6-1ubuntu0.4+esm3",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.6-1ubuntu0.4+esm4",
"evidence": "/affected/1/versions"
},
{
"value": "2:3.0.6-1ubuntu0.4+esm5",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "redis",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4:4.0.1-7",
"evidence": "/affected/2/versions"
},
{
"value": "4:4.0.2-6",
"evidence": "/affected/2/versions"
},
{
"value": "4:4.0.2-9",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.6-1",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.6-2",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.7-1",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.8-1",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.8-2",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.9-1",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.9-1ubuntu0.1",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.9-1ubuntu0.2",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.9-1ubuntu0.2+esm2",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.9-1ubuntu0.2+esm3",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.9-1ubuntu0.2+esm4",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.9-1ubuntu0.2+esm5",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.9-1ubuntu0.2+esm6",
"evidence": "/affected/2/versions"
},
{
"value": "5:4.0.9-1ubuntu0.2+esm7",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "redis",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5:5.0.5-2build1",
"evidence": "/affected/3/versions"
},
{
"value": "5:5.0.6-1",
"evidence": "/affected/3/versions"
},
{
"value": "5:5.0.7-1",
"evidence": "/affected/3/versions"
},
{
"value": "5:5.0.7-2",
"evidence": "/affected/3/versions"
},
{
"value": "5:5.0.7-2ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
},
{
"value": "5:5.0.7-2ubuntu0.1",
"evidence": "/affected/3/versions"
},
{
"value": "5:5.0.7-2ubuntu0.1+esm1",
"evidence": "/affected/3/versions"
},
{
"value": "5:5.0.7-2ubuntu0.1+esm2",
"evidence": "/affected/3/versions"
},
{
"value": "5:5.0.7-2ubuntu0.1+esm3",
"evidence": "/affected/3/versions"
},
{
"value": "5:5.0.7-2ubuntu0.1+esm4",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "redis",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5:6.0.15-1",
"evidence": "/affected/4/versions"
},
{
"value": "5:6.0.16-1",
"evidence": "/affected/4/versions"
},
{
"value": "5:6.0.16-1build1",
"evidence": "/affected/4/versions"
},
{
"value": "5:6.0.16-1ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "5:6.0.16-1ubuntu1+esm1",
"evidence": "/affected/4/versions"
},
{
"value": "5:6.0.16-1ubuntu1+esm2",
"evidence": "/affected/4/versions"
},
{
"value": "5:6.0.16-1ubuntu1.1",
"evidence": "/affected/4/versions"
},
{
"value": "5:6.0.16-1ubuntu1.1+esm1",
"evidence": "/affected/4/versions"
},
{
"value": "5:6.0.16-1ubuntu1.2",
"evidence": "/affected/4/versions"
},
{
"value": "5:6.0.16-1ubuntu1.2+esm1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "redis",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5:7.0.12-1",
"evidence": "/affected/5/versions"
},
{
"value": "5:7.0.14-1",
"evidence": "/affected/5/versions"
},
{
"value": "5:7.0.14-2",
"evidence": "/affected/5/versions"
},
{
"value": "5:7.0.15-1",
"evidence": "/affected/5/versions"
},
{
"value": "5:7.0.15-1build1",
"evidence": "/affected/5/versions"
},
{
"value": "5:7.0.15-1build2",
"evidence": "/affected/5/versions"
},
{
"value": "5:7.0.15-1ubuntu0.24.04.1",
"evidence": "/affected/5/versions"
},
{
"value": "5:7.0.15-1ubuntu0.24.04.2",
"evidence": "/affected/5/versions"
},
{
"value": "5:7.0.15-1ubuntu0.24.04.3",
"evidence": "/affected/5/versions"
},
{
"value": "5:7.0.15-1ubuntu0.24.04.4",
"evidence": "/affected/5/versions"
},
{
"value": "5:7.0.15-1ubuntu0.24.04.5",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "valkey",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.2.11+dfsg1-0ubuntu0.2",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": [
{
"value": "7.2.5+dfsg1-2ubuntu4~24.04.1",
"evidence": "/affected/6/versions"
},
{
"value": "7.2.7+dfsg1-0ubuntu0.24.04.1",
"evidence": "/affected/6/versions"
},
{
"value": "7.2.8+dfsg1-0ubuntu0.24.04.1",
"evidence": "/affected/6/versions"
},
{
"value": "7.2.8+dfsg1-0ubuntu0.24.04.2",
"evidence": "/affected/6/versions"
},
{
"value": "7.2.8+dfsg1-0ubuntu0.24.04.3",
"evidence": "/affected/6/versions"
},
{
"value": "7.2.10+dfsg1-0ubuntu0.1",
"evidence": "/affected/6/versions"
},
{
"value": "7.2.11+dfsg1-0ubuntu0.1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "redict",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.3.2+ds-1",
"evidence": "/affected/7/versions"
},
{
"value": "7.3.5+ds-1",
"evidence": "/affected/7/versions"
},
{
"value": "7.3.5+ds-1ubuntu0.1",
"evidence": "/affected/7/versions"
},
{
"value": "7.3.5+ds-1ubuntu0.2",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "redict",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.3.6+ds-1",
"evidence": "/affected/8/versions"
},
{
"value": "7.3.6+ds-2",
"evidence": "/affected/8/versions"
},
{
"value": "7.3.6+ds-2build1",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "redict",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.3.5+ds-1",
"evidence": "/affected/9/versions"
},
{
"value": "7.3.5+ds-1ubuntu0.1",
"evidence": "/affected/9/versions"
},
{
"value": "7.3.6+ds-1",
"evidence": "/affected/9/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2025-21605",
"aliases": [
"UBUNTU-CVE-2025-21605"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "redis",
"purl": "pkg:deb/ubuntu/redis?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"2:2.6.13-1",
"2:2.6.16-3",
"2:2.8.0-1",
"2:2.8.2-1",
"2:2.8.4-2",
"2:2.8.4-2ubuntu0.2",
"2:2.8.4-2ubuntu0.2+esm1",
"2:2.8.4-2ubuntu0.2+esm2",
"2:2.8.4-2ubuntu0.2+esm3",
"2:2.8.4-2ubuntu0.2+esm4",
"2:2.8.4-2ubuntu0.2+esm5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-21605.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "redis-server",
"binary_version": "2:2.8.4-2ubuntu0.2+esm5"
},
{
"binary_name": "redis-tools",
"binary_version": "2:2.8.4-2ubuntu0.2+esm5"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "redis",
"purl": "pkg:deb/ubuntu/redis?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"2:3.0.3-3",
"2:3.0.5-1",
"2:3.0.5-2",
"2:3.0.5-3",
"2:3.0.5-4",
"2:3.0.6-1",
"2:3.0.6-1ubuntu0.2",
"2:3.0.6-1ubuntu0.3",
"2:3.0.6-1ubuntu0.4",
"2:3.0.6-1ubuntu0.4+esm1",
"2:3.0.6-1ubuntu0.4+esm2",
"2:3.0.6-1ubuntu0.4+esm3",
"2:3.0.6-1ubuntu0.4+esm4",
"2:3.0.6-1ubuntu0.4+esm5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-21605.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "redis-sentinel",
"binary_version": "2:3.0.6-1ubuntu0.4+esm5"
},
{
"binary_name": "redis-server",
"binary_version": "2:3.0.6-1ubuntu0.4+esm5"
},
{
"binary_name": "redis-tools",
"binary_version": "2:3.0.6-1ubuntu0.4+esm5"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "redis",
"purl": "pkg:deb/ubuntu/redis?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"4:4.0.1-7",
"4:4.0.2-6",
"4:4.0.2-9",
"5:4.0.5-1",
"5:4.0.6-1",
"5:4.0.6-2",
"5:4.0.7-1",
"5:4.0.8-1",
"5:4.0.8-2",
"5:4.0.9-1",
"5:4.0.9-1ubuntu0.1",
"5:4.0.9-1ubuntu0.2",
"5:4.0.9-1ubuntu0.2+esm2",
"5:4.0.9-1ubuntu0.2+esm3",
"5:4.0.9-1ubuntu0.2+esm4",
"5:4.0.9-1ubuntu0.2+esm5",
"5:4.0.9-1ubuntu0.2+esm6",
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],
"modified": "2026-10-17T12:57:01.542627039Z",
"provider": "osv",
"upstream": [
"CVE-2025-21605"
],
"references": [
"https://ubuntu.com/security/CVE-2025-21605",
"https://www.cve.org/CVERecord?id=CVE-2025-21605",
"https://github.com/redis/redis/security/advisories/GHSA-r67f-p999-2gff",
"https://github.com/valkey-io/valkey/pull/1994",
"https://github.com/redis/redis/releases/tag/7.4.3"
]
},
"related_cves": [
{
"value": "CVE-2025-21605",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 356649,
"published_at": "2025-04-23T16:15:00+00:00"
}