8.1
HIGH
CVE-2020-8259
Nextcloud Server Decryption Key Manipulation Vulnerability
Description

Insufficient protection of the server-side encryption keys in Nextcloud Server 19.0.1 allowed an attacker to replace the encryption keys.

INFO

Published Date :

Nov. 16, 2020, 1:15 a.m.

Last Modified :

Sept. 27, 2022, 3:46 p.m.

Remotely Exploitable :

Yes !

Impact Score :

5.2

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2020-8259 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Nextcloud nextcloud_server
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2020-8259.

URL Resource
https://hackerone.com/reports/732431 Exploit Issue Tracking Third Party Advisory
https://nextcloud.com/security/advisory/?id=NC-SA-2020-041 Broken Link Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2020-8259 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2020-8259 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Sep. 27, 2022

    Action Type Old Value New Value
    Changed Reference Type https://nextcloud.com/security/advisory/?id=NC-SA-2020-041 Vendor Advisory https://nextcloud.com/security/advisory/?id=NC-SA-2020-041 Broken Link, Vendor Advisory
    Changed CPE Configuration OR *cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:*:*:*:* versions up to (excluding) 20.0.0 OR *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* versions up to (excluding) 20.0.0
  • Initial Analysis by [email protected]

    Dec. 02, 2020

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
    Changed Reference Type https://hackerone.com/reports/732431 No Types Assigned https://hackerone.com/reports/732431 Exploit, Issue Tracking, Third Party Advisory
    Changed Reference Type https://nextcloud.com/security/advisory/?id=NC-SA-2020-041 No Types Assigned https://nextcloud.com/security/advisory/?id=NC-SA-2020-041 Vendor Advisory
    Added CWE NIST CWE-522
    Added CPE Configuration OR *cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:*:*:*:* versions up to (excluding) 20.0.0
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-8259 is associated with the following CWEs:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.11 }} 0.02%

score

0.43115

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability