CVE-2021-32689

Name: CVE-2021-32689
Creator: NVD / NIST
Published: 2021-07-12T19:15:10.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.00%

Last modified Jun 17, 2026

CVE-2021-32689 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 1.00% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.00%

58.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Talk	< 11.2.2

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895cThird Party Advisory
https://github.com/nextcloud/spreed/pull/5633Patch, Third Party Advisory
https://github.com/nextcloud/spreed/releases/tag/v11.2.2Release Notes, Third Party Advisory
https://github.com/nextcloud/spreed/releases/tag/v11.3.0Release Notes, Third Party Advisory
https://hackerone.com/reports/1200700Permissions Required
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xv6f-344w-895cThird Party Advisory
https://github.com/nextcloud/spreed/pull/5633Patch, Third Party Advisory
https://github.com/nextcloud/spreed/releases/tag/v11.2.2Release Notes, Third Party Advisory
https://github.com/nextcloud/spreed/releases/tag/v11.3.0Release Notes, Third Party Advisory
https://hackerone.com/reports/1200700Permissions Required

Timeline

Published: Jul 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32689?

How severe is CVE-2021-32689?

CVE-2021-32689 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.00% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32689?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-32689?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST