CVE-2025-64055: An issue was discovered in Fanvil x210 V2 2.12.20 allowing unauthenticated attackers on the local network to a

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CRITICAL 9.8REMOTEMITIGATE

CVE-2025-64055 is a critical-severity flaw (CVSS 9.8) affecting x210 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Fanvil x210 V2 2.12.20 allowing unauthenticated attackers on the local network to access administrative functions of the device (e.g. file upload, firmware update, reboot...) via a crafted authentication bypass.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-287
Published	2025-12-03
Last modified	2026-09-25

Publisher (CNA): MITRE · Vendor: fanvil

Last updated 2026-09-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-03 21:15 UTCPublished CVE record published
2026-09-25 23:10 UTCUpdated Record last modified

fanvil x210 firmware MITIGATE

Affected: 2.12.20

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.12.20

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · jgmenu · FIXED · 4.7.0-1.eln159 · FEDORA-2026-40fa69cb49 · source

sudo dnf upgrade --advisory=FEDORA-2026-40fa69cb49

Fedora 46 · trustedqsl · FIXED · 2.8.7-1.fc46 · FEDORA-2026-6b1bc90ebc · source

sudo dnf upgrade --advisory=FEDORA-2026-6b1bc90ebc

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/SpikeReply/advisories/blob/main/cve/fanvil/cve-2025-64055.md

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-2025-64055?

x210 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-64055 being exploited?

CVE-2025-64055 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-2025-64055 affect?

CVE-2025-64055 affects x210 firmware. Severity is critical (CVSS 9.8). An issue was discovered in Fanvil x210 V2 2.12.20 allowing unauthenticated attackers on the local network to access administrative functions of the device (e.g. file upload, firmware update, reboot...) via a crafted authentication bypass.

How urgent is CVE-2025-64055?

Priority 58/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-64053 HIGH 7.5 MITIGATE A Buffer overflow vulnerability on Fanvil x210 2.12.20 devices allows attackers to cause a denial of service o
CVE-2025-64057 HIGH 8.3 MITIGATE Directory traversal vulnerability in Fanvil x210 V2 2.12.20 allows unauthenticated attackers on the local netw
CVE-2025-64056 MEDIUM 4.3 MITIGATE File upload vulnerability in Fanvil x210 V2 2.12.20 allows unauthenticated attackers on the local network to s
CVE-2025-64054 CRITICAL 9.6 MITIGATE A reflected Cross Site Scripting (XSS) vulnerability on Fanvil x210 2.12.20 devices allows attackers to cause
CVE-2025-64052 MEDIUM 5.1 MITIGATE An issue was discovered in Fanvil x210 V2 2.12.20 allowing unauthenticated attackers on the local network to e

References

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