Vulnerability in Go Standard Library Net/http

CVE-2025-4673

Proxy-Authorization and Proxy-Authenticate headers persisted on cross-origin redirects potentially leaking sensitive information.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-4673: held from 0.006 to 0.007.

EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.001

Affected products

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-4673?
CVE-2025-4673 is a medium-severity vulnerability in Go Standard Library Net/http, classified under CWE-201: INSERTION OF SENSITIVE INFORMATION INTO SENT DATA. CVSS score: 6.8/10. Published 2025-06-11.
How severe is CVE-2025-4673?
Medium severity. CVSS v3 base score is 6.8 out of 10.
Is CVE-2025-4673 known to be exploited?
4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.