Vulnerability Report

CVE-2021-32689

Title: Nextcloud Talk Username Reuse Chat Message Access

Privilege Escalation

Proof Of Concept

No public PoC currently indexed for CVE-2021-32689.

CWE Category CWE-200
Published Date Jul 12, 2021
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 8.1 CVSS v3.1
Exploit Probability (EPSS)
1.00%

Vulnerability Summary

CVE-2021-32689: Nextcloud Talk is a fully on-premises audio/video and chat communication service. In versions prior to 11.2.2, if a user was able to reuse an earlier used username, they could get access to any chat message sent to the previous user with this username. The issue was patched in versions 11.2.2 and 11.3.0. As a workaround, don't allow users to choose usernames themselves. This is the default behaviour of Nextcloud, but some user providers may allow doing so.

Impacted Vendors

G
google 1
D
drupal 1
N
nextcloud 1

Reference Links

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895c https://github.com/nextcloud/spreed/pull/5633 https://github.com/nextcloud/spreed/releases/tag/v11.2.2 https://github.com/nextcloud/spreed/releases/tag/v11.3.0 https://hackerone.com/reports/1200700 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895c https://github.com/nextcloud/spreed/pull/5633 https://github.com/nextcloud/spreed/releases/tag/v11.2.2 https://github.com/nextcloud/spreed/releases/tag/v11.3.0 https://hackerone.com/reports/1200700
CVSS v3.1
Source Entity [email protected]
Severity HIGH
8.1
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
6.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
4.0
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:L/Au:S/C:P/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-32689 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected Stack

No specific products linked.