CVE-2025-64054: A reflected Cross Site Scripting (XSS) vulnerability on Fanvil x210 2.12.20 devices allows attackers to cause

This month

CRITICAL 9.6MITIGATE

CVE-2025-64054 is a critical-severity flaw (CVSS 9.6) affecting x210 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A reflected Cross Site Scripting (XSS) vulnerability on Fanvil x210 2.12.20 devices allows attackers to cause a denial of service or potentially execute arbitrary commands via crafted POST request to the /cgi-bin/webconfig?page=upload&action=submit endpoint.

Why this priority

Critical severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-12-05
Last modified	2026-07-05

Publisher (CNA): MITRE · Vendor: fanvil

Last updated 2026-07-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-05 16:15 UTCPublished CVE record published
2026-07-05 02:17 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.

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-2025-64054?

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

Is CVE-2025-64054 being exploited?

CVE-2025-64054 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-2025-64054 affect?

CVE-2025-64054 affects x210 firmware. Severity is critical (CVSS 9.6). A reflected Cross Site Scripting (XSS) vulnerability on Fanvil x210 2.12.20 devices allows attackers to cause a denial of service or potentially execute arbitrary commands via crafted POST request to the /cgi-bin/webconfig?page=upload&actio

How urgent is CVE-2025-64054?

Priority 48/100. Critical severity; Public exploit reference

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-2025-64055 CRITICAL 9.8 MITIGATE An issue was discovered in Fanvil x210 V2 2.12.20 allowing unauthenticated attackers on the local network to a
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-2025-64052 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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