CVE-2025-69247Public exploitNetwork attack vector

Unauthenticated UPF crash via unchecked SDF length

Published Feb 23, 2026 · Updated Feb 23, 2026

Heap buffer overflow in free5GC go-upf before 1.2.8 allows remote attackers to crash the UPF via a malformed PFCP request. The newSdfFilter path passes the SDF Filter IE to SDFFilterFields.UnmarshalBinary without checking that FDLength fits the available payload. No credentials or user interaction are required, but PFCP reachability and a valid session context are needed; successful exploitation terminates UPF service and its active sessions.

CVSS severity7.5
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in free5GC go-upf before 1.2.8 allows remote attackers to crash the UPF via a malformed PFCP request. The newSdfFilter path passes the SDF Filter IE to SDFFilterFields.UnmarshalBinary without checking that FDLength fits the available payload. No credentials or user interaction are required, but PFCP reachability and a valid session context are needed; successful exploitation terminates UPF service and its active sessions.

The record

CVE
CVE-2025-69247
Published
Feb 23, 2026
Updated
Feb 23, 2026
Vendor
free5GC
Product
go-upf
Classifications
CWE-122, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 23, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.2.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

free5GC · go-upfversion=< 1.2.8

Published CVSS scores

2.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
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-122Heap-based 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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