What is CVE-2021-3189?

CVE-2021-3189 is a medium-severity vulnerability in Google Slashify, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-02-19.

How severe is CVE-2021-3189?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Open Redirect in Google Slashify

CVE-2021-3189

The slashify package 1.0.0 for Node.js allows open-redirect attacks, as demonstrated by a localhost:3000///example.com/ substring.

Vulnerability class: Open Redirect

Published 2021-02-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Google Slashify — versions 1.0.0

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

www.npmjs.com/package/slashify (Product)
securitylab.github.com/advisories/GHSL-2020-199-open-redirect-slashify (Exploit, Third Party Advisory)
security.netapp.com/advisory/ntap-20210401-0004/ (Third Party Advisory)

Frequently asked questions

What is CVE-2021-3189?: CVE-2021-3189 is a medium-severity vulnerability in Google Slashify, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-02-19.
How severe is CVE-2021-3189?: Medium severity. CVSS v3 base score is 6.1 out of 10.