Security advisory
Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, Nextcloud Server did not implement a database backend for rate-limiting purposes. Any component of Nextcloud using rate-limits (as as `AnonRateThrottle` or `UserRateThrottle`) was thus not rate limited on instances not having a memory cache backend configured. In the case of a default installation, this would notably include the rate-limits on the two factor codes. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5, or 22.2.0. As a workaround, enable a memory cache backend in `config.php`.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-41177
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:56 UTC · Revision 1
Source evidence
Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, Nextcloud Server did not implement a database backend for rate-limiting purposes. Any component of Nextcloud using rate-limits (as as `AnonRateThrottle` or `UserRateThrottle`) was thus not rate limited on instances not having a memory cache backend configured. In the case of a default installation, this would notably include the rate-limits on the two factor codes. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5, or 22.2.0. As a workaround, enable a memory cache backend in `config.php`.
osv:CVE-2021-41177
Complete source record
{
"id": "28546494565a36a42f5057be842abeebc12127956f2758fbba3247575377bed5",
"url": "https://osv.dev/vulnerability/CVE-2021-41177",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-41177",
"summary": "Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, Nextcloud Server did not implement a database backend for rate-limiting purposes. Any component of Nextcloud using rate-limits (as as `AnonRateThrottle` or `UserRateThrottle`) was thus not rate limited on instances not having a memory cache backend configured. In the case of a default installation, this would notably include the rate-limits on the two factor codes. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5, or 22.2.0. As a workaround, enable a memory cache backend in `config.php`.",
"evidence": "osv:CVE-2021-41177",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-41177",
"aliases": [
"CVE-2021-41177",
"GHSA-fj39-4qx4-m3f2"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/nextcloud/server",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "43a0a9a3213588d5f6fc88a0e52df6b8a0b9b9ec"
},
{
"introduced": "8985b7930653139859002eb3eca2852999ed8f0d"
},
{
"fixed": "64e55fdd4a9ab38d5ad5e8fe457b2912e43efead"
},
{
"introduced": "c67e1420c8f741bfa43db08fcc295ec3b156fff8"
},
{
"fixed": "07e359b7de671a81a7baad701d4496a9f871a770"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "20.0.13"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "21.0.0"
},
{
"fixed": "21.0.5"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "22.0.0"
},
{
"fixed": "22.2.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v20.0.13rc1",
"v21.0.5rc1",
"v22.2.0rc2",
"v22.1.1",
"v22.1.1rc2",
"v22.1.1rc1",
"v21.0.4",
"v22.1.0",
"22.1.0",
"v22.1.0rc1",
"v21.0.4rc1",
"v22.0.0",
"v20.0.11",
"v21.0.3",
"v21.0.3rc1",
"v20.0.11rc1",
"v20.0.10",
"v21.0.2",
"v20.0.10RC1",
"v21.0.2RC1",
"v20.0.9",
"v21.0.1",
"v21.0.1RC1",
"v20.0.9RC1",
"v20.0.8",
"v21.0.0",
"v20.0.8RC1",
"v20.0.7RC1",
"v20.0.7",
"v20.0.6",
"v20.0.6RC1",
"v20.0.5",
"v20.0.5RC2",
"v20.0.5RC1",
"v20.0.4",
"v20.0.3",
"v20.0.3RC2",
"v20.0.2",
"v20.0.2RC2",
"v20.0.2RC1",
"v20.0.1",
"v20.0.1RC1",
"v20.0.0",
"v20.0.0RC2",
"v20.0.0RC1",
"v20.0.0beta4",
"v20.0.0beta3",
"v20.0.0beta2",
"v20.0.0beta1",
"v19.0.0RC2",
"v19.0.0RC1",
"v19.0.0beta7",
"v19.0.0beta6",
"v19.0.0beta5",
"v19.0.0beta4",
"v19.0.0beta3",
"v19.0.0beta2",
"v19.0.0beta1",
"v18.0.0RC1",
"v18.0.0beta4",
"v18.0.0beta3",
"v18.0.0beta2",
"v18.0.0beta1",
"v17.0.0beta4",
"v17.0.0beta3",
"v17.0.0beta2",
"v17.0.0beta1",
"v16.0.0RC1",
"v16.0.0beta3",
"v16.0.0beta2",
"v16.0.0beta1",
"v16.0.0alpha1",
"v15.0.0RC1",
"v15.0.0beta2",
"v15.0.0beta1",
"v14.0.0RC2",
"v14.0.0RC1",
"v14.0.0beta4",
"v14.0.0beta3",
"v14.0.0beta2",
"v14.0.0beta1",
"v13.0.0RC1",
"v13.0.0beta4",
"v13.0.0beta3",
"v13.0.0beta2",
"v13.0.0beta1",
"v12.0.0beta4",
"v12.0.0beta3",
"v12.0.0beta2",
"v12.0.0beta1",
"v11.0.0",
"v11.0RC2",
"v9.1.0beta1",
"v9.0.0beta2",
"v9.0beta1",
"v8.2RC1",
"v8.2beta1",
"v8.1RC2",
"v8.1.0beta2",
"v8.1.0beta1",
"v8.1.0alpha2",
"v8.1.0alpha1",
"v8.0.0",
"v8.0.0RC2",
"v8.0.0RC1",
"v8.0.0beta2",
"v8.0.0beta1",
"v8.0.0alpha2",
"v8.0.0alpha1",
"v7.0.0beta1",
"v7.0.0alpha2",
"v6.0.0RC2",
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"v6.0.0beta5",
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"v6.0.0beta3",
"v6.0.0beta2",
"v6.0.0alpha2",
"v5.0.0",
"v5.0.0RC3",
"v5.0.0RC2",
"v5.0.0RC1",
"v5.0.0beta2",
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"v5.0.0alpha1",
"v4.5.0",
"v4.5.0RC3",
"v4.5.0RC2",
"v4.5.0RC1",
"v4.5.0beta4",
"v4.5.0beta3",
"v4.0.6",
"v4.0.5",
"v4.0.4",
"v4.0.1",
"v4.0.0",
"v4.0.0RC2",
"v4.0.0RC",
"v4.0.0beta",
"v3.0",
"v1.0.0beta1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-41177.json"
}
}
],
"modified": "2026-10-20T10:54:57.690242589Z",
"provider": "osv",
"references": [
"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fj39-4qx4-m3f2",
"https://security.gentoo.org/glsa/202208-17",
"https://hackerone.com/reports/1265709",
"https://github.com/nextcloud/server/pull/28728"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-41177",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 386555,
"published_at": "2021-10-25T22:15:07.847+00:00"
}