Denial of service in Nextcloud Server

Published: 2021-01-25
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-8295
Exploitation vector Network
Public exploit N/A
Vulnerable software
Nextcloud Server
Client/Desktop applications / Messaging software

Vendor Nextcloud

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Resource exhaustion

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-8295

CWE-ID: CWE-400 - Uncontrolled Resource Consumption ('Resource Exhaustion')

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when resetting a user password. A remote attacker can perform a denial of service (DoS) attack.


Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 18.0.0, 18.0.1, 18.0.2, 18.0.3, 18.0.4, 18.0.5, 18.0.6, 18.0.7, 18.0.8, 18.0.9, 18.0.10, 19.0.0, 19.0.1, 19.0.2, 19.0.3, 19.0.4

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.