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Fencer Intel
medium 6.1

CVE-2020-23015 json

An open redirect issue was discovered in OPNsense through 20.1.5.

published 5y ago modified 4mo ago also EUVD-2020-15771

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known, plus a Nuclei check

Summary

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.

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Exploit prediction

2.68% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • Nuclei template OPNsense <=20.1.5 - Open Redirect nuclei detection template
  • github.com https://github.com/opnsense/core/issues/4061 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N

Classification

Weakness
  • CWE-601 URL Redirection to Untrusted Site

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.