CVE-2024-56921Public exploitNetwork attack vector

Unauthenticated AMF crash via stale authentication response

Published Feb 3, 2025 · Updated Mar 22, 2025

Denial of service in Open5GS AMF 2.7.2 allows remote attackers to crash the process via repeated UE registration requests. The gmm_state_exception() function aborts when a delayed Nausf_UEAuthentication_Authenticate response for a released UE context reaches an unhandled NAUSF state. No authentication is required, but exploitation depends on timing repeated registrations so an older AUSF response arrives after the prior context is released.

CVSS severity7.5
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Open5GS AMF 2.7.2 allows remote attackers to crash the process via repeated UE registration requests. The gmm_state_exception() function aborts when a delayed Nausf_UEAuthentication_Authenticate response for a released UE context reaches an unhandled NAUSF state. No authentication is required, but exploitation depends on timing repeated registrations so an older AUSF response arrives after the prior context is released.

The record

CVE
CVE-2024-56921
Published
Feb 3, 2025
Updated
Mar 22, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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