Open Redirect in Fastify Fastify-Static

CVE-2021-22964

A redirect vulnerability in the `fastify-static` module version >= 4.2.4 and < 4.4.1 allows remote attackers to redirect Mozilla Firefox users to arbitrary websites via a double slash `//` followed by a domain: `http://localhost:3000//a//youtube.com/%2e%2e%2f%2e%2e`.A DOS vulnerability is possible if the URL contains invalid characters `curl --path-as-is "http://localhost:3000//^/.."`The issue shows up on all the `fastify-static` applications that set `redirect: true` option. By default, it is `false`.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.010 (61.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:H.

Affected products

  • Fastify Fastify-static
  • N/a Https://github.com/fastify/fastify-static — versions Affected >= v4.2.4, Fixed v4.4.1

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-22964?
CVE-2021-22964 is a high-severity vulnerability in Fastify Fastify-Static, classified under Uncontrolled Resource Consumption. CVSS score: 8.8/10. Published 2021-10-14.
How severe is CVE-2021-22964?
High severity. CVSS v3 base score is 8.8 out of 10.