CVE-2025-65562Public exploitNetwork attack vector

Unauthenticated service crash via oversized SEID

Published Dec 18, 2025 · Updated Dec 18, 2025

Improper array-index validation in free5GC UPF 4.1.0 allows remote attackers to crash the service via a crafted PFCP deletion request. LocalNode.Sess() and LocalNode.DeleteSess() convert the untrusted uint64 SEID to int, subtract one, and index n.sess without a lower-bound check. No authentication is required; a reachable PFCP endpoint accepts the oversized value and terminates the UPF process with a Go runtime panic.

CVSS severity7.5
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper array-index validation in free5GC UPF 4.1.0 allows remote attackers to crash the service via a crafted PFCP deletion request. LocalNode.Sess() and LocalNode.DeleteSess() convert the untrusted uint64 SEID to int, subtract one, and index n.sess without a lower-bound check. No authentication is required; a reachable PFCP endpoint accepts the oversized value and terminates the UPF process with a Go runtime panic.

The record

CVE
CVE-2025-65562
Published
Dec 18, 2025
Updated
Dec 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-129, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 18, 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-129Improper Validation of Array Index
T1499.004Application or System Exploitation Denial of Service

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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