CVE-2023-49391Public exploitNetwork attack vector

Service crash via unchecked nil remote address

Published Dec 22, 2023 · Updated Sep 12, 2024

Denial of service in the free5GC 3.3.0 AMF allows remote attackers to crash the service via a malformed NGAP message. The Dispatch function calls String on a nil value returned by the SCTP connection's RemoteAddr method instead of rejecting the invalid connection state. An unauthenticated connection to the AMF NGAP service on SCTP port 38412 is sufficient, and the reported crash leaves the AMF unable to restart.

CVSS severity7.5
High
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the free5GC 3.3.0 AMF allows remote attackers to crash the service via a malformed NGAP message. The Dispatch function calls String on a nil value returned by the SCTP connection's RemoteAddr method instead of rejecting the invalid connection state. An unauthenticated connection to the AMF NGAP service on SCTP port 38412 is sufficient, and the reported crash leaves the AMF unable to restart.

The record

CVE
CVE-2023-49391
Published
Dec 22, 2023
Updated
Sep 12, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 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
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 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-94Improper Control of Generation of Code ('Code Injection')
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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