CVE-2025-29632Public exploitNetwork attack vector

AMF crash via unchecked empty NAS payload

Published May 29, 2025 · Updated May 29, 2025

Buffer overflow in free5GC 4.0.0 and earlier allows remote attackers to crash the AMF through a crafted NGAP InitialUEMessage. handleInitialUEMessageMain checks only whether nASPDU is nil, then DecodePlainNasNoIntegrityCheck reads a security header from an empty byte slice. An attacker with SCTP network access to the AMF NGAP interface can interrupt the AMF process without authentication or user interaction.

CVSS severity5.4
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in free5GC 4.0.0 and earlier allows remote attackers to crash the AMF through a crafted NGAP InitialUEMessage. handleInitialUEMessageMain checks only whether nASPDU is nil, then DecodePlainNasNoIntegrityCheck reads a security header from an empty byte slice. An attacker with SCTP network access to the AMF NGAP interface can interrupt the AMF process without authentication or user interaction.

The record

CVE
CVE-2025-29632
Published
May 29, 2025
Updated
May 29, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2025CVE publishedPublication date reported by the CVE source.
  2. May 29, 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

5.4CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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