What is CVE-2025-21620?

CVE-2025-21620 is a high-severity vulnerability in Denoland Deno, classified under Information Disclosure. CVSS score: 7.5/10. Published 2025-01-06.

How severe is CVE-2025-21620?

High severity. CVSS v3 base score is 7.5 out of 10.

Information disclosure in Denoland Deno

CVE-2025-21620

Deno is a JavaScript, TypeScript, and WebAssembly runtime with secure defaults. When you send a request with the Authorization header to one domain, and the response asks to redirect to a different domain, Deno'sfetch() redirect handling c…

Vulnerability class: Information Disclosure

EPSS: 0.003 (49.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Denoland Deno — versions < 2.1.2

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

https://github.com/denoland/deno/security/advisories/GHSA-f27p-cmv8-xhm6 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2025-21620?: CVE-2025-21620 is a high-severity vulnerability in Denoland Deno, classified under Information Disclosure. CVSS score: 7.5/10. Published 2025-01-06.
How severe is CVE-2025-21620?: High severity. CVSS v3 base score is 7.5 out of 10.