What is CVE-2020-23015?

CVE-2020-23015 is a medium-severity vulnerability in Opnsense, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-05-03.

How severe is CVE-2020-23015?

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

Is CVE-2020-23015 known to be exploited?

7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Open Redirect in Opnsense

CVE-2020-23015

An open redirect issue was discovered in OPNsense through 20.1.5. The redirect parameter "url" in login page was not filtered and can redirect user to any website.

Vulnerability class: Open Redirect

Published 2021-05-03 · 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: 0.027 (85.3th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 85.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.027 · newest: 0.027 · change: 0.000

Affected products

Opnsense

Weakness classification (CWE)

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

Public proof-of-concept exploits

References

github.com/opnsense/core/issues/4061 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-23015?: CVE-2020-23015 is a medium-severity vulnerability in Opnsense, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-05-03.
How severe is CVE-2020-23015?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2020-23015 known to be exploited?: 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.