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CVE-2025-66405

Portkey Gateway server-side request forgery (SSRF)

9.8 CRITICALEPSS 0.37%
  1. Published1 Dec 2025

Description

Portkey.ai Gateway is a blazing fast AI Gateway with integrated guardrails. Prior to 1.14.0, the gateway determined the destination baseURL by prioritizing the value in the x-portkey-custom-host request header. The proxy route then appends the client-specified path to perform an external fetch. This can be maliciously used by users for SSRF attacks. This vulnerability is fixed in 1.14.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Portkey Gateway< 1.14.0

Remediation

Fixed in
Portkey Gateway≥ 1.14.0

References

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Frequently asked

Is CVE-2025-66405 being actively exploited?

CVE-2025-66405 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.37%.

How severe is CVE-2025-66405?

CVE-2025-66405 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.37% probability of exploitation.

Which products are affected by CVE-2025-66405?

Affected products include Portkey Gateway.

How do I fix CVE-2025-66405?

Upgrade affected software to a fixed version, for example Portkey Gateway 1.14.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-66405 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.