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Fencer Intel
critical 9.6

CVE-2020-24377 json

A DNS rebinding vulnerability in the Freebox OS web interface in Freebox Server before 4.2.3.

published 6y ago modified 4mo ago also EUVD-2020-17109

cvss
9.6
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

A DNS rebinding vulnerability in the Freebox OS web interface in Freebox Server before 4.2.3.

Patch / fix

  • free freebox_revolution_firmware 4.2.3
  • free freebox_mini_firmware 4.2.3
  • free freebox_one_firmware 4.2.3
  • free freebox_delta_firmware 4.2.3
  • free freebox_pop_firmware 4.2.3

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Exploit prediction

1.19% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • gabriel.urdhr.fr https://www.gabriel.urdhr.fr/2020/09/23/dns-rebinding-freebox/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

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.