What’s Vulnerable › Vulnerabilities

CVE-2021-22879

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-04-14 · updated 2026-06-17
• Weakness: CWE-99

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.

Affected products

• Fedoraproject Fedora: 33
• Desktop Client: before 3.1.3 — fixed in 3.1.3

How to fix

Upgrade to a fixed version: Desktop Client 3.1.3. Check the vendor advisory for mitigations.

References

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

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