CVE-2020-24375: A DNS rebinding vulnerability in the UPnP MediaServer implementation in Freebox Server before 4.2.3.

Q: How do I fix CVE-2020-24375?

freebox server: upgrade to 4.2.3; freebox v5 firmware: upgrade to 1.5.29. Exact commands for each OS are on this page.

Q: Is CVE-2020-24375 being exploited?

CVE-2020-24375 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-24375 affect?

CVE-2020-24375 affects freebox server, freebox v5 firmware. Severity is medium (CVSS 6.5). A DNS rebinding vulnerability in the UPnP MediaServer implementation in Freebox Server before 4.2.3.

Q: How urgent is CVE-2020-24375?

Priority 44/100. Public exploit reference

This month

MEDIUM 6.5UPGRADEUPGRADE

CVE-2020-24375 is a medium-severity flaw (CVSS 6.5) affecting freebox server, freebox v5 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A DNS rebinding vulnerability in the UPnP MediaServer implementation in Freebox Server before 4.2.3.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-290
Published	2020-10-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: free

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-10-19 19:15 UTCPublished CVE record published
2026-06-17 03:05 UTCUpdated Record last modified

free freebox server UPGRADE

Affected: < 4.2.3

Fixed in: 4.2.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy freebox-server || rpm -q freebox-server || freebox-server --version

2. UPGRADE to 4.2.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade freebox-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade freebox-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

free freebox v5 firmware UPGRADE

Affected: < 1.5.29

Fixed in: 1.5.29

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-24375?

freebox server: upgrade to 4.2.3; freebox v5 firmware: upgrade to 1.5.29. Exact commands for each OS are on this page.

Is CVE-2020-24375 being exploited?

CVE-2020-24375 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-24375 affect?

CVE-2020-24375 affects freebox server, freebox v5 firmware. Severity is medium (CVSS 6.5). A DNS rebinding vulnerability in the UPnP MediaServer implementation in Freebox Server before 4.2.3.

How urgent is CVE-2020-24375?

Priority 44/100. Public exploit reference

References

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