CVE-2026-1683Public exploitNetwork attack vectorHinoki check available

Process crash via unchecked PFCP ReportType dereference

Published Jan 30, 2026 · Updated Jan 30, 2026

NULL pointer dereference in free5GC SMF 4.0 and 4.1.0 allows remote attackers to crash the process via a malformed PFCP request. HandlePfcpSessionReportRequest reads req.ReportType.Dldr without first verifying that the mandatory ReportType IE is present. Exploitation requires PFCP access and a valid session in the deactivated state; the resulting panic terminates the entire SMF process.

CVSS severity5.3
Medium
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

NULL pointer dereference in free5GC SMF 4.0 and 4.1.0 allows remote attackers to crash the process via a malformed PFCP request. HandlePfcpSessionReportRequest reads req.ReportType.Dldr without first verifying that the mandatory ReportType IE is present. Exploitation requires PFCP access and a valid session in the deactivated state; the resulting panic terminates the entire SMF process.

The record

CVE
CVE-2026-1683
Published
Jan 30, 2026
Updated
Jan 30, 2026
Vendor
free5GC
Product
SMF
Classifications
CWE-404, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 30, 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=4.0
  2. Affected versionversion=4.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

free5GC · SMFversion=4.0; version=4.1.0

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
5.5VulDBCVSS: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:P
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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-404Improper Resource Shutdown or Release
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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