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CVE-2021-22963

22
FAUCET Score

CVE-2021-22963 is a redirect vulnerability in fastify-static versions prior to 4.2.4, allowing remote attackers to redirect users to arbitrary websites. This issue affects applications where the 'redirect' option is explicitly set to true. With a CVSS score of 6.1 (Medium), exploitation requires user interaction (UI:R) and could lead to information disclosure (C:L) and integrity impacts (I:L). There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.2.4CPE matchmatch criteria
cpe:2.3:a:fastify:fastify-static:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.13%
Probability of exploitation in next 30 days
EPSS Percentile
63.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0113 is in the 76th percentile among its peer group of 26,234 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

npmpatch availablevia ghsa
Product: fastify-staticFixed in: 4.2.4
redhatno patchvia redhat_api
Product: Red Hat Advanced Cluster Management for Kubernetes 2Fixed in: rhacm2/search-ui-rhel8

Vendor Advisories (2)

npmGHSA-p6vg-p826-qp3vmedium

URL Redirection to Untrusted Site ('Open Redirect') in fastify-static

Oct 5, 2021
redhatCVE-2021-22963Moderate

fastify-static: open redirect via an URL with double slash followed by a domain

Sep 29, 2021

References

hackerone.com / reports/1354255
ExploitIssue TrackingThird Party Advisory