Vulnerability · Published Jul 12, 2021 · Assigned by GitHub_M

CVE-2021-32741Lack of ratelimit on public share link mount endpoint

Medium 5.3

In plain English

A medium-severity security flaw in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 71% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)1.3%top 29.0% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
nextcloud	security-advisories	< 19.0.13>= 20.0.0, < 20.0.11>= 21.0.0, < 21.0.3

Weakness: CWE-799 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-crvj-vmf7-xrvr x_refsource_CONFIRM
https://github.com/nextcloud/server/pull/26958 x_refsource_MISC
https://hackerone.com/reports/1192144 x_refsource_MISC