7.5

CVE-2025-21620: denoland deno

CVSS: 7.5v3.1HighDeferred
AliasesGHSA-f27p-cmv8-xhm6
Published 06-01-2025Last modified 07-01-2025
Open JSON

Vulnerability summary

CVE-2025-21620 is a high (CVSS 7.5) vulnerability in denoland deno. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 43% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.52%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 06-01-2025
    PublishedVulnerability first disclosed.
  2. 07-01-2025
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 3 sources · 2 versions

EPSS trend

Probability

0.52%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

+0.01 pp

From 0.51% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.52%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Crates.Io2 products
  • deno≤ 1.46.3 | ≥ 2.0.0, < 2.1.2
  • deno_fetch≥ 0.0.1, < 0.204.0
Denoland1 product

2 vendors · 3 products

References

3 links