CVE-2021-22877

MEDIUMNVD 6.56.5—

6.5

A missing user check in Nextcloud prior to 20.0.6 inadvertently populates a user's own credentials for other users external storage configuration when not already configured yet.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 51.5%
KEV: Not listed

Published

March 3, 2021

Last Modified

November 21, 2024

References (10)

support@hackeronehttps://github.com/nextcloud/server/issues/24600
support@hackeronehttps://github.com/nextcloud/server/pull/25224
support@hackeronehttps://hackerone.com/reports/1061591
support@hackeronehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
support@hackeronehttps://nextcloud.com/security/advisory/?id=NC-SA-2021-004
af854a3a-2127-422b-91ae-364da2661108https://github.com/nextcloud/server/issues/24600
af854a3a-2127-422b-91ae-364da2661108https://github.com/nextcloud/server/pull/25224
af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/1061591
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
af854a3a-2127-422b-91ae-364da2661108https://nextcloud.com/security/advisory/?id=NC-SA-2021-004

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 20:13 UTCEG score recompute
2026-05-26 20:13 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:49 UTCepss_batch
2026-05-23 09:01 UTCOSV refresh

Frequently asked(5)

What is CVE-2021-22877?

CVE-2021-22877 is a medium vulnerability published on March 3, 2021. A missing user check in Nextcloud prior to 20.0.6 inadvertently populates a user's own credentials for other users external storage configuration when not already configured yet.

When was CVE-2021-22877 disclosed?

CVE-2021-22877 was first published in the National Vulnerability Database on March 3, 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-2021-22877 actively exploited?

CVE-2021-22877 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 51.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-22877?

CVE-2021-22877 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2021-22877?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-22877, 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.

Dependency Blast Radius

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CVE-2021-22877

📅 Published

🔄 Last Modified

🔗 References (10)

Weakness Classification(3)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-22877?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (10)

Frequently asked(5)

Related CVEs(same CWE)