How severe is CVE-2021-3647?

CVE-2021-3647 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-3647 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3647?

CVE-2021-3647 affects Uri.js Project Uri.js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3647?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-3647 published?

CVE-2021-3647 was published on 2021-07-16 and last updated on 2026-06-17.

CVE-2021-3647

CVE-2021-3647 is a medium-severity vulnerability in Uri.js Project Uri.js with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 5.8
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Uri.js Project Uri.js
Published: 2021-07-16
Last modified: 2026-06-17

Description

URI.js is vulnerable to URL Redirection to Untrusted Site

Frequently asked questions

What is CVE-2021-3647?: URI.js is vulnerable to URL Redirection to Untrusted Site
How severe is CVE-2021-3647?: CVE-2021-3647 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-3647 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3647?: CVE-2021-3647 affects Uri.js Project Uri.js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3647?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3647 published?: CVE-2021-3647 was published on 2021-07-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:uri.js_project:uri.js:*:*:*:*:*:*:*:*

More vulnerabilities in Uri.js Project Uri.js

CVE-2021-27516 — High (CVSS 7.5): URI.js (aka urijs) before 1.19.6 mishandles certain uses of backslash such as http:\/ and interprets the URI as a…
CVE-2022-0613 — Medium (CVSS 6.5): Authorization Bypass Through User-Controlled Key in NPM urijs prior to 1.19.8.
CVE-2020-26291 — Medium (CVSS 6.5): URI.js is a javascript URL mutation library (npm package urijs). In URI.js before version 1.19.4, the hostname can be…
CVE-2022-1243 — Medium (CVSS 6.1): CRHTLF can lead to invalid protocol extraction potentially leading to XSS in GitHub repository medialize/uri.js prior…
CVE-2022-1233 — Medium (CVSS 6.1): URL Confusion When Scheme Not Supplied in GitHub repository medialize/uri.js prior to 1.19.11.
CVE-2022-0868 — Medium (CVSS 6.1): Open Redirect in GitHub repository medialize/uri.js prior to 1.19.10.

All CVEs affecting Uri.js Project Uri.js →

Other CWE-601 (Open Redirect) vulnerabilities

CVE-2018-3774 — Critical (CVSS 10.0): Incorrect parsing in url-parse <1.4.3 returns wrong hostname which leads to multiple vulnerabilities such as SSRF, Open…
CVE-2019-25282 — Critical (CVSS 9.8): V-SOL GPON/EPON OLT Platform v2.03 contains an open redirect vulnerability in the script that allows attackers to…
CVE-2020-36912 — Critical (CVSS 9.8): Plexus anblick Digital Signage Management 3.1.13 contains an open redirect vulnerability in the 'PantallaLogin' script…
CVE-2025-43526 — Critical (CVSS 9.8): This issue was addressed with improved URL validation. This issue is fixed in Safari 26.2, macOS Tahoe 26.2. On a Mac…
CVE-2025-55031 — Critical (CVSS 9.8): Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An…
CVE-2024-22891 — Critical (CVSS 9.8): Nteract v.0.28.0 was discovered to contain a remote code execution (RCE) vulnerability via the Markdown link.

Browse all CWE-601 (Open Redirect) vulnerabilities →