Is this vulnerability remotely exploitable over the internet?

Exploitability depends on network design. If the AMF's SBI interface is reachable from untrusted networks or peers, an attacker could potentially exploit it remotely. In well-segmented 5G cores, access may be restricted to internal or trusted network functions, reducing but not eliminating exposure if any NF is compromised.

Does an attacker need authentication or valid 5G credentials to exploit this?

According to the description, no authentication is required. The attacker only needs network-level access to the AMF SBI endpoint and the ability to send crafted JSON requests.

What is the safest general fix pattern for this issue?

The most robust pattern is to introduce a dedicated validation layer that all SBI requests pass through, which validates JSON against explicit schemas and enforces strict type and range checks before invoking any AMF business logic. Additionally, error handling should ensure malformed data cannot crash or stall the service.

Severity:

HIGH RISK

(7.5)

Improper Input Validation (CWE-20) in OpenAirInterface CN5G AMF SBI JSON Handling

CVE-2025-66786

Published:

Jan 7, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20

Impact:

Denial of Service

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20

Impact:

Denial of Service

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Improper Input Validation (CWE-20) in OpenAirInterface CN5G AMF SBI JSON Handling

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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