Vulnerability · Published Jun 11, 2021 · Assigned by hackerone
CVE-2021-22915
Critical 9.8
In plain English
A critical-severity security flaw in Nextcloud Server. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 78% of all known vulnerabilities).
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)1.7%top 22.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Nextcloud server before 19.0.11, 20.0.10, 21.0.2 is vulnerable to brute force attacks due to lack of inclusion of IPv6 subnets in rate-limiting considerations. This could potentially result in an attacker bypassing rate-limit controls such as the Nextcloud brute-force protection.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | Nextcloud Server | Fixed in 19.0.11, 20.0.10, 21.0.2 |
Weakness: CWE-307
References
- https://hackerone.com/reports/1154003 x_refsource_MISC
- https://nextcloud.com/security/advisory/?id=NC-SA-2021-009 x_refsource_MISC
- FEDORA-2021-eac0e52f88 vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-afa7968aeb vendor-advisory, x_refsource_FEDORA