CVE-2021-22963

Public Exploit

Description

A redirect vulnerability in the fastify-static module version < 4.2.4 allows remote attackers to redirect users to arbitrary websites via a double slash // followed by a domain: http://localhost:3000//google.com/%2e%2e.The issue shows up on all the fastify-static applications that set redirect: true option. By default, it is false.

Category

6.1
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.17%
Third-Party Advisory hackerone.com
Affected: n/a https://github.com/fastify/fastify-static
Published at:
Updated at:

References

Link Tags
https://hackerone.com/reports/1354255 issue tracking exploit third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-22963?
CVE-2021-22963 has been scored as a medium severity vulnerability.
How to fix CVE-2021-22963?
To fix CVE-2021-22963, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-22963 being actively exploited in the wild?
It is possible that CVE-2021-22963 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-22963?
CVE-2021-22963 affects n/a https://github.com/fastify/fastify-static.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.