CVE-2021-41177
HIGHEPSS 72th pctlDescription
Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, Nextcloud Server did not implement a database backend for rate-limiting purposes. Any component of Nextcloud using rate-limits (as as `AnonRateThrottle` or `UserRateThrottle`) was thus not rate limited on instances not having a memory cache backend configured. In the case of a default installation, this would notably include the rate-limits on the two factor codes. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5, or 22.2.0. As a workaround, enable a memory cache backend in `config.php`.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Exploit Intelligence
Elevated risk: more likely to be exploited than 72% of all known CVEs.
References
Related Vulnerabilities
Other CWE-799 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-35621 | High | 7.5 | 2.3% | - | - |
| CVE-2016-6543 | Medium | 5.9 | 2.2% | - | - |
| CVE-2021-37910 | Low | 3.7 | 2.1% | - | Fix |
| CVE-2021-32705 | Medium | 5.3 | 1.7% | - | Fix |
| CVE-2021-32703 | Medium | 5.3 | 1.5% | - | Fix |
| CVE-2021-32678 | Low | 3.7 | 1.4% | - | Fix |
Common questions
How do I fix CVE-2021-41177?
Upgrade nextcloud server to 22.2.0 or later.
Is CVE-2021-41177 being actively exploited?
Not that we know of. CVE-2021-41177 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 1.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 72% of all scored CVEs.
How severe is CVE-2021-41177?
CVE-2021-41177 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2021-41177 affect?
Published advisories record a fix for nextcloud server (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2021-41177
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.