CVE-2025-70123Public exploitNetwork attack vector

Service interruption via malformed PFCP association request

Published Feb 13, 2026 · Updated Feb 13, 2026

Improper input validation in free5GC 4.0.1 allows remote attackers to interrupt UPF service through malformed PFCP requests. The UPF accepts an Association Setup Request whose contained-item length exceeds its container, records a successful association, and enters an inconsistent state when a valid Session Establishment Request follows. Access to UDP port 8805 is sufficient to force the SMF into a reconnection loop and degrade core-network service.

CVSS severity7.5
High
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

Improper input validation in free5GC 4.0.1 allows remote attackers to interrupt UPF service through malformed PFCP requests. The UPF accepts an Association Setup Request whose contained-item length exceeds its container, records a successful association, and enters an inconsistent state when a valid Session Establishment Request follows. Access to UDP port 8805 is sufficient to force the SMF into a reconnection loop and degrade core-network service.

The record

CVE
CVE-2025-70123
Published
Feb 13, 2026
Updated
Feb 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2026Record 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-20Improper Input Validation
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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