CVE-2021-32703 Lack of ratelimit on shareinfo endpoint

What is CVE-2021-32703?

CVE-2021-32703 is a medium-severity vulnerability in Fedoraproject Fedora, published on 12 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

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 shareinfo 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.

Weakness: CWE-307, CWE-799

Which versions are affected by CVE-2021-32703?

It affects 2 products.

Products include Fedoraproject Fedora, Nextcloud Nextcloud Server.

How do I fix CVE-2021-32703?

Upgrade to a fixed version.

Is CVE-2021-32703 being exploited?

There is no known exploitation of CVE-2021-32703 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-375p-cxxq-gc9p.