CVE-2020-24376: A DNS rebinding vulnerability in the UPnP IGD implementations in Freebox v5 before 1.5.29 and Freebox Server b

Q: How do I fix CVE-2020-24376?

freebox revolution firmware: upgrade to 4.2.3; freebox mini firmware: upgrade to 4.2.3; freebox one firmware: upgrade to 4.2.3. Exact commands for each OS are on this page.

Q: Is CVE-2020-24376 being exploited?

CVE-2020-24376 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-2020-24376 affect?

CVE-2020-24376 affects freebox revolution firmware, freebox mini firmware, freebox one firmware. Severity is critical (CVSS 9.6). A DNS rebinding vulnerability in the UPnP IGD implementations in Freebox v5 before 1.5.29 and Freebox Server before 4.2.3.

Q: How urgent is CVE-2020-24376?

Priority 49/100. Critical severity

This month

CRITICAL 9.6UPGRADEUPGRADEUPGRADE

CVE-2020-24376 is a critical-severity flaw (CVSS 9.6) affecting freebox revolution firmware, freebox mini firmware, freebox one 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 IGD implementations in Freebox v5 before 1.5.29 and Freebox Server before 4.2.3.

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-20
Published	2020-09-16
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

2020-09-16 20:15 UTCPublished CVE record published
2026-06-17 03:05 UTCUpdated Record last modified

free freebox revolution firmware UPGRADE

Affected: < 4.2.3

Fixed in: 4.2.3

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.

free freebox mini firmware UPGRADE

Affected: < 4.2.3

Fixed in: 4.2.3

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.

free freebox one firmware UPGRADE

Affected: < 4.2.3

Fixed in: 4.2.3

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.

free freebox delta firmware UPGRADE

Affected: < 4.2.3

Fixed in: 4.2.3

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.

free freebox pop firmware UPGRADE

Affected: < 4.2.3

Fixed in: 4.2.3

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-2020-24376?

freebox revolution firmware: upgrade to 4.2.3; freebox mini firmware: upgrade to 4.2.3; freebox one firmware: upgrade to 4.2.3. Exact commands for each OS are on this page.

Is CVE-2020-24376 being exploited?

CVE-2020-24376 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-2020-24376 affect?

CVE-2020-24376 affects freebox revolution firmware, freebox mini firmware, freebox one firmware. Severity is critical (CVSS 9.6). A DNS rebinding vulnerability in the UPnP IGD implementations in Freebox v5 before 1.5.29 and Freebox Server before 4.2.3.

How urgent is CVE-2020-24376?

Priority 49/100. Critical severity

Related CVEs

CVE-2020-24377 CRITICAL 9.6 UPGRADE UPGRADE A DNS rebinding vulnerability in the Freebox OS web interface in Freebox Server before 4.2.3.
CVE-2020-24373 HIGH 8.8 UPGRADE UPGRADE A CSRF vulnerability in the UPnP MediaServer implementation in Freebox Server before 4.2.3.

References

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