CVE-2025-21620 — HIGH (7.5)

Vulnerability Description

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 creates a follow-up redirect request that keeps the original Authorization header, leaking its content to that second domain. This vulnerability is fixed in 2.1.2.

CVSS Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Related Weaknesses (CWE)

CWE-200

References

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

FAQ

What is CVE-2025-21620?

CVE-2025-21620 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 do...

How severe is CVE-2025-21620?

CVE-2025-21620 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-21620?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.