CVE-2025-52288Public exploitNetwork attack vector

AMF crash via stale UE context assertion

Published Sep 8, 2025 · Updated Sep 8, 2025

Reachable assertion in Open5GS 2.7.5 and earlier allows remote attackers to crash the AMF through repeated UE reconnects. During an SBI timeout, amf_state_operational continues after the RAN-UE context has been removed, deassociated, or mismatched, causing ngap_build_downlink_nas_transport to assert on a missing AMF-UE object. Access to the NGAP-facing core-network path and the ability to drive rapid UE connection churn are required; exploitation terminates the AMF and takes the gNB offline.

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

Reachable assertion in Open5GS 2.7.5 and earlier allows remote attackers to crash the AMF through repeated UE reconnects. During an SBI timeout, amf_state_operational continues after the RAN-UE context has been removed, deassociated, or mismatched, causing ngap_build_downlink_nas_transport to assert on a missing AMF-UE object. Access to the NGAP-facing core-network path and the ability to drive rapid UE connection churn are required; exploitation terminates the AMF and takes the gNB offline.

The record

CVE
CVE-2025-52288
Published
Sep 8, 2025
Updated
Sep 8, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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