CVE-2021-22879

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation5% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
5%
EPSS %ILE
91%
KEV
Not listed

Published

April 14, 2021

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Aug 6, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

Nextcloud Desktop Client: User-assisted execution of arbitrary code (GLSA 202105-37) — Gentoo security

https://security.gentoo.org/glsa/202105-37
generic

Security in Nextcloud

https://nextcloud.com/security/advisory/?id=NC-SA-2021-008
generic

[SECURITY] Fedora 33 Update: nextcloud-client-3.1.3-1.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTWBJAS5DJJIK7LLVBZZQTSJASUVIRVE/
generic

HackerOne

https://hackerone.com/reports/1078002
github_pr

Validate sensitive URLs to onle allow http(s) schemes.

Fix merged in nextcloud/desktop PR #2906 on 2021-02-09 — awaiting tagged release

https://github.com/nextcloud/desktop/pull/2906

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
nextcloud-desktop—3.1.1-2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
nextcloud-desktop—3.1.1-2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nextcloud-desktop—3.1.1-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nextcloud-desktop—3.1.1-2—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 157 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2021-22879?
CVE-2021-22879 is a high vulnerability published on April 14, 2021. 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.
When was CVE-2021-22879 disclosed?
CVE-2021-22879 was first published in the National Vulnerability Database on April 14, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-22879 actively exploited?
CVE-2021-22879 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5% probability of exploitation in the next 30 days, which ranks it in the top 8.6% of all scored CVEs.
What is the CVSS score of CVE-2021-22879?
CVE-2021-22879 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-22879?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-22879, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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