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[email protected]CVE-2021-22915

HistoryJun 11, 2021 - 4:15 p.m.

CVE-2021-22915

2021-06-1116:15:11

CWE-307

[email protected]

web.nvd.nist.gov

nextcloud

cve-2021-22915

brute force

ipv6

rate-limiting

nextcloud server

5 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9.2 High

AI Score

Confidence

High

0.005 Low

EPSS

Percentile

77.4%

JSON

Nextcloud server before 19.0.11, 20.0.10, 21.0.2 is vulnerable to brute force attacks due to lack of inclusion of IPv6 subnets in rate-limiting considerations. This could potentially result in an attacker bypassing rate-limit controls such as the Nextcloud brute-force protection.

Affected configurations

NVD

Node

nextcloudnextcloud_serverRange<19.0.11

nextcloudnextcloud_serverRange20.0.0–20.0.10

nextcloudnextcloud_serverRange21.0.0–21.0.2

Node

fedoraprojectfedoraMatch33

fedoraprojectfedoraMatch34

CPENameOperatorVersion
nextcloud:nextcloud_servernextcloud nextcloud serverlt19.0.11
nextcloud:nextcloud_servernextcloud nextcloud serverlt20.0.10
nextcloud:nextcloud_servernextcloud nextcloud serverlt21.0.2

CPE	Name	Operator	Version
nextcloud:nextcloud_server	nextcloud nextcloud server	lt	19.0.11
nextcloud:nextcloud_server	nextcloud nextcloud server	lt	20.0.10
nextcloud:nextcloud_server	nextcloud nextcloud server	lt	21.0.2

CNA Affected

[
  {
    "product": "Nextcloud Server",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "Fixed in 19.0.11, 20.0.10, 21.0.2"
      }
    ]
  }
]