CVE-2023-47347Public exploitNetwork attack vector

UPF crash via unchecked PFCP slice bounds

Published Nov 15, 2023 · Updated Aug 29, 2024

Buffer overflow in the free5GC UPF 3.3.0 allows remote attackers to crash the service with a malformed PFCP Heartbeat Request. In the go-pfcp IE.UnmarshalBinary path, unchecked slice bounds on the malformed input produce a slice-bounds runtime panic. No authentication or special configuration is required; successful exploitation terminates the UPF and interrupts packet forwarding.

CVSS severity7.5
High
EPSS probability0.74%
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 the free5GC UPF 3.3.0 allows remote attackers to crash the service with a malformed PFCP Heartbeat Request. In the go-pfcp IE.UnmarshalBinary path, unchecked slice bounds on the malformed input produce a slice-bounds runtime panic. No authentication or special configuration is required; successful exploitation terminates the UPF and interrupts packet forwarding.

The record

CVE
CVE-2023-47347
Published
Nov 15, 2023
Updated
Aug 29, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 2024Record 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

7.5NIST NVDCVSS: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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Endpoint Denial of Service: Application 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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