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CVE-2021-22963

MEDIUM
6.1
CVSS Score
Published: October 14, 2021 at 02:50 PM UTC
Updated: June 17, 2026 at 03:38 AM UTC
1 product affected across 1 vendorFastify Static

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Severity
MEDIUM6.1
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fastify Static· Fastify
95%
v < 4.2.4
Affected range stops below 4.2.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCExploitIssue TrackingThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/1354255

CVSS

6.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-601

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