CVE-2021-22879

Name: CVE-2021-22879
Creator: NVD / NIST
Published: 2021-04-14T13:15:13.04+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 4.70%

Last modified Jun 17, 2026

CVE-2021-22879 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Nextcloud Desktop Client prior to 3.1.3 is vulnerable to resource injection by way of missing validation of URLs, allowing a malicious server to execute remote commands. User interaction is needed for exploitation.. EPSS estimates a 4.70% chance of exploitation in the next 30 days.

Description

Nextcloud Desktop Client prior to 3.1.3 is vulnerable to resource injection by way of missing validation of URLs, allowing a malicious server to execute remote commands. User interaction is needed for exploitation.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

4.70%

90.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Desktop	< 3.1.3
Fedoraproject	Fedora	33

References

https://github.com/nextcloud/desktop/pull/2906Patch, Third Party Advisory
https://hackerone.com/reports/1078002Exploit, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTWBJAS5DJJIK7LLVBZZQTSJASUVIRVE/
https://nextcloud.com/security/advisory/?id=NC-SA-2021-008Vendor Advisory
https://security.gentoo.org/glsa/202105-37Third Party Advisory
https://github.com/nextcloud/desktop/pull/2906Patch, Third Party Advisory
https://hackerone.com/reports/1078002Exploit, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTWBJAS5DJJIK7LLVBZZQTSJASUVIRVE/
https://nextcloud.com/security/advisory/?id=NC-SA-2021-008Vendor Advisory
https://security.gentoo.org/glsa/202105-37Third Party Advisory

Timeline

Published: Apr 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22879?

How severe is CVE-2021-22879?

CVE-2021-22879 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 4.70% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22879?

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-2021-22879?

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

Scan your code now

Source: NVD / NIST