Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the public share link mount endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.
CVE-2021-32741
MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 43% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.3Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.3
- EG Score
- 5.3(medium)
- EPSS
- 67.5%
- KEV
- Not listed
Published
July 12, 2021
Last Modified
November 21, 2024
References (6)
- security-advisories@githubhttps://github.com/nextcloud/security-advisories/security/advisories/GHSA-crvj-vmf7-xrvr
- security-advisories@githubhttps://github.com/nextcloud/server/pull/26958
- security-advisories@githubhttps://hackerone.com/reports/1192144
- af854a3a-2127-422b-91ae-364da2661108https://github.com/nextcloud/security-advisories/security/advisories/GHSA-crvj-vmf7-xrvr
- af854a3a-2127-422b-91ae-364da2661108https://github.com/nextcloud/server/pull/26958
- af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/1192144
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Frequently asked(5)
What is CVE-2021-32741?
CVE-2021-32741 is a medium vulnerability published on July 12, 2021. Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the public share link mount endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. The issue was fixed in…
When was CVE-2021-32741 disclosed?
CVE-2021-32741 was first published in the National Vulnerability Database on July 12, 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-2021-32741 actively exploited?
CVE-2021-32741 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-32741?
CVE-2021-32741 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2021-32741?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-32741, 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
Explore the affected products and dependency analysis for CVE-2021-32741
Is Your Infrastructure Affected by CVE-2021-32741?
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