How severe is CVE-2025-66508?

CVE-2025-66508 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-66508 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66508?

CVE-2025-66508 affects Fit2cloud 1panel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66508?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-66508 have an EU (EUVD) identifier?

Yes. CVE-2025-66508 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201792.

When was CVE-2025-66508 published?

CVE-2025-66508 was published on 2025-12-09 and last updated on 2026-06-17.

CVE-2025-66508

CVE-2025-66508 is a medium-severity vulnerability in Fit2cloud 1panel with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-290.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201792
Weakness: CWE-290
Affected product: Fit2cloud 1panel
Published: 2025-12-09
Last modified: 2026-06-17

Description

1Panel is an open-source, web-based control panel for Linux server management. Versions 2.0.14 and below use Gin's default configuration which trusts all IP addresses as proxies (TrustedProxies = 0.0.0.0/0), allowing any client to spoof the X-Forwarded-For header. Since all IP-based access controls (AllowIPs, API whitelists, localhost-only checks) rely on ClientIP(), attackers can bypass these protections by simply sending X-Forwarded-For: 127.0.0.1 or any whitelisted IP. This renders all IP-based security controls ineffective. This issue is fixed in version 2.0.14.

Frequently asked questions

What is CVE-2025-66508?: 1Panel is an open-source, web-based control panel for Linux server management. Versions 2.0.14 and below use Gin's default configuration which trusts all IP addresses as proxies (TrustedProxies = 0.0.0.0/0), allowing any client to spoof the X-Forwarded-For header. Since all IP-based access controls (AllowIPs, API whitelists, localhost-only checks) rely on ClientIP(), attackers can bypass these protections by simply sending X-Forwarded-For: 127.0.0.1 or any whitelisted IP. This renders all IP-based security controls ineffective. This issue is fixed in version 2.0.14.
How severe is CVE-2025-66508?: CVE-2025-66508 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-66508 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66508?: CVE-2025-66508 affects Fit2cloud 1panel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66508?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66508 have an EU (EUVD) identifier?: Yes. CVE-2025-66508 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201792.
When was CVE-2025-66508 published?: CVE-2025-66508 was published on 2025-12-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fit2cloud:1panel:*:*:*:*:*:*:*:*

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